Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
hanh tang » hanh trang, anh tang, hanh mang
nang cong » nang song, dang cong, bang cong
thanh ban » thanh san, thanh van, thanh bac
cong dan » cong san, cong tan, huong dan
than ban » toan ban, than man, nhuan ban
ho hieu » ho chieu, hoi hieu, nho hieu
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 - hanh tang va nang cong dan ((than ban) OR (thanh ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quan - hanh tang va nang cong dan ((than ban) OR (thanh ban))".
• Adding a wildcard symbol may retrieve word variants: ho hieu quan - hanh tang va nang cong dan ((than ban) OR (thanh ban))*.