Perhaps you should try some spelling variations:
trong tuan » trong quan, trong tan, trang tuan
trung tuan » trung thanh, trung tam, tran tuan
hien sang » hien trang, khien bang, chieu sang
dung cong » dung trong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sang - hanh ((trong tuan) OR (trung tuan)) dung cong tap toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien sang - hanh ((trong tuan) OR (trung tuan)) dung cong tap toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - hanh ((trong tuan) OR (trung tuan)) dung cong tap toan cao*.