Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
hoang van » hang va
nang cong » nang song, dang cong, bang cong
nho hieu » nha hieu, nho sieu, nhu hieu
tang van » dang van, trong van, tang luan
cong dan » cong san, cong tan, huong dan
toan cau » toan ban, toan tap, toan tai
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: nho hieu quan - hanh ((tang van) or (hoang van)) nang cong dan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu quan - hanh ((tang van) OR (hoang van)) nang cong dan ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: nho hieu quan - hanh ((tang van) or (hoang van)) nang cong dan ((toan cau) or (toan cao))*.