Perhaps you should try some spelling variations:
thien quan » trien quang, lien quan, thien van
hieu quan » hieu qua, lieu quan, lien quan
hanh tang » hanh trang, anh tang, hanh mang
nang cong » nang song, dang cong, bang cong
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than ban » thanh ban, toan ban, than man
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 (thien quan)) - hanh tang va nang cong tan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quan) OR (thien quan)) - hanh tang va nang cong tan than ban.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quan) or (thien quan)) - hanh tang va nang cong tan than ban*.