Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
chiet tach » chieu sach
dung cong » dung trong
tran tan » tran tuan, tran thanh, trang tuan
tran van » luan van
cong tap » cuong tap, cong tac, cong tan
tap doan » tap quan
doan cau » toan cau, doan dau, doan 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 ((nhieu tang) or (chiet tach)) - manh ((tran tan) OR (tran van)) dung cong tap doan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((nhieu tang) OR (chiet tach)) - manh ((tran tan) OR (tran van)) dung cong tap doan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((nhieu tang) or (chiet tach)) - manh ((tran tan) OR (tran van)) dung cong tap doan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((nhieu tang) or (chiet tach)) - manh ((tran tan) OR (tran van)) dung cong tap doan cau*.