These departures meant that Bulku would feature more frequently in the first team and he did so making an impressive 21 appearances in his second season in which he won his first trophy of his career, the Albanian Superliga title.

He did however manage to win the Albanian Supercup at the start of the season but his side Tirana narrowly lost the race for the title to Vllaznia Shkodër.

During the 2007–08 route he was often as a starter under coach Oleh Taran forming partnerships in the midfield with fellow Albanian Dorian Bylykbashi, Ruslan Kostyshyn and Anatoliy Oprya.

[12] This was followed by another one in the next game week as Bulku scored the opening goal in the 7th minute against Zorya Luhansk on 4 April 2009 as the match eventually finished in the 2–1 victory.

He retained his starting place playing 13 out 14 games as a starter but Kryvbas suffered a worst progress taking only two wins and 1 draw and conceding 14 losses.

[22] On 21 July 2012, Bulku signed a one-year contract with Iranian champions Sepahan F.C., joining there another fellow Albanian player Xhevahir Sukaj, who had come in the team early on January.

[30] Bulku made his first appearance of the season on 24 August, playing full-90 minutes in the opening championship match against Apolonia Fier, which ended in a 3–0 win at Qemal Stafa Stadium.

[31] He scored his first goal of the season on day three, netting a last-minute equalizer in a 1–1 away draw against Vllaznia Shkodër which was infamously marred by crowd trouble which saw 13 people arrested and both clubs' fans receiving lengthy stadium bans.

[36] Bulku played for Albania national under-21 football team 15 matches and scored 1 goal in the 2000 & 2002 UEFA European Under-21 Championship qualification between years from 1999 to 2002.

[36][37] Bulku was part of Albania national football team since 2002 when he made his debut under coach Sulejman Demollari on 17 April 2002 against Andorra, coming on as a substitute in place of Altin Rraklli in the 54th minute in a 2–0 loss.

He wasn't included in national team until 2006 when he was called up by coach Otto Barić for the UEFA Euro 2008 qualifying match against Netherlands on 11 October.

[39] Bulku retained his starting place for the 2014 FIFA World Cup qualifiers under coach Gianni De Biasi playing 9 out 10 matches as a starter.

[40] During the UEFA Euro 2016 qualifying under same coach De Biasi, Bulku was regularly called up into the national side, except for the two closing matches in October 2015 but however he participated in just one match vs Armenia on 29 March 2015, this due to upcomings of fellow defensive midfielders from Switzerland national under-21 football team such as Taulant Xhaka, Amir Abrashi, Migjen Basha and also the presence of experienced and younger players Burim Kukeli, Ledian Memushaj and Ergys Kaçe.

[41][10] In November 2015 Bulku was appointed as assistant manager of Gianni De Biasi at the Albania national football team becoming the third one after Paolo Tramezzani and Erjon Bogdani.

[45][46] In the match played at Estadi Nacional, Albania won comfortably 3–0; two of the goals were scored by Bekim Balaj and Amir Abrashi, who were brought on by Bulku as substitutions.