Perhaps you should try some spelling variations:
nhiet tach » chiet tach
nhung cong » dung cong, thong cong, hang cong
hoc nhiet » hoc thiet, hoc nghien, hoc hien
trang va » hang va
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nhiet tach - hanh ((trang va) or (tran van)) nhung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nhiet tach - hanh ((trang va) OR (tran van)) nhung cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc nhiet tach - hanh ((trang va) or (tran van)) nhung cong dan than cau*.