Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhieu tang » chieu sang, nhiet nang
quoc nhung » quoc hung, nuoc nhung, duoc nhung
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, hieu van
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: theo ((hieu lang) or (nhieu tang)) - thanh trung quoc nhung cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (nhieu tang)) - thanh trung quoc nhung cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (nhieu tang)) - thanh trung quoc nhung cong tap toan cao*.