Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh tran » hanh trang, thanh tran, hanh tram
dang cong » dung cong
hieu van » hieu va, thien van, lieu va
tran van » luan van
dan toan » van toan, dan than, manh 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 ((nhieu tang) or (hieu van)) - hanh tran van ((trong cong) or (dang cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((nhieu tang) OR (hieu van)) - hanh tran van ((trong cong) OR (dang cong)) dan toan cao.
• Adding a wildcard symbol may retrieve word variants: theo ((nhieu tang) or (hieu van)) - hanh tran van ((trong cong) or (dang cong)) dan toan cao*.