Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
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 chan » dan gian, dan ca, van chat
chan ban » can ban, chat ban, chan nan
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 (hieu qua)) - hanh tang va nang cong dan chan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quan) OR (hieu qua)) - hanh tang va nang cong dan chan ban.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quan) or (hieu qua)) - hanh tang va nang cong dan chan ban*.