Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
trang va » hang va
tran van » luan van
cong san » cong tac
san toan » van toan, dan toan, 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: ho ((chieu xanh) or (hieu quang)) - hanh ((trang va) or (tran van)) nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (hieu quang)) - hanh ((trang va) OR (tran van)) nhung cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (hieu quang)) - hanh ((trang va) or (tran van)) nhung cong san toan cao*.