He lectures on general linguistics and conducts practical courses in French, Italian, Persian, Finnish, Basque, Welsh, and other languages.
In 1968, on Biletsky’s recommendation, Tyshchenko was assigned to lead a dialectological expedition at Taras Shevchenko National University of Kyiv to 5 cities on the Caucasian Black Sea coast.
In 1970, Tyshchenko was elected a member of its editorial board for high professionalism and outstanding work on the materials from the Caucasus coast for this atlas, which was prepared by scientists from different countries.
Linguistics became the first science for which metatheory was developed, which adequately reflects the mutual location and correlation of the accumulated knowledge about the system of world languages and their properties.
After two years of military service (1963-1965) and after entering graduate school, at the invitation of Professor Andrii Biletsky and under his leadership Tyshchenko in 1965 began to teach theoretical courses in general linguistics and admission to linguistics for students of I and V years of study of the then Faculty of Philology and the Faculty of Foreign Languages of KSU.
Tyshchenko's research on Slavic languages is devoted to certain aspects of their teaching to foreigners and linguistic and cultural contacts of Slavs with their historical neighbors.
Several publications on German studies reflect certain aspects of Tyshchenko's scientific interests and are mainly related to linguistic and historical issues.
[6] Tyshchenko's publications on Arabic studies dealt mainly with historical aspects of Slavic-Arab contacts between the Persian period and later (the peak dates back to the years of the Arab-Khazar war of 710-737).
Several articles by Tyshchenko are devoted mainly to the historical aspects of Slavic-Altaic contacts during the early Middle Ages and the period of migration.
This group of publications reflects the results of the application of a new promising method for the study of toponymic systems, developed by Tyshchenko over the years.
In order to promote the achievements of toponymy as an auxiliary historical discipline among high school students in collaboration with the Institute of Information Technology and Teaching Aids of the Academy of Pedagogical Sciences of Ukraine Tyshchenko and the museum created in 2007 educational film Language Gifts old neighbors.
Tyshchenko was the first since 1965 to teach Italian at the Taras Shevchenko University of Kiev in optional groups, as well as Hindi, Swahili, Dutch, Portuguese, Polish, Belarusian and Ukrainian languages.
Tyshchenko co-initiated the creation in 1985 of experimental Romance groups (ERG), organized to study a number of methodological problems of language teaching.
[3] He theoretically substantiated its structure and over the past decades, together with his students, prepared more than 300 large-format color displays of the current exposition of the museum.