Perhaps you should try some spelling variations:
hieu quan » hieu qua, thien quan, lien quan
lieu quan » lien quan, hieu qua, lieu van
hanh tang » hanh trang, anh tang, hanh mang
nang cong » nang song, dang cong, bang cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
tang va » trang va, tang van, thang va
va nang » van nang, da nang, cam nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu quan) or (lieu quan)) - hanh tang va nang cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quan) OR (lieu quan)) - hanh tang va nang cong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quan) or (lieu quan)) - hanh tang va nang cong dan toan ban*.