Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
hieu quan » hieu qua, lieu quan, thien quan
tranh cua » doanh cua
hang cong » dang cong, hang nong, bang cong
manh cua » doanh cua, ban cua
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((nhieu tang) or (hieu quan)) - hanh ((tranh cua) OR (manh cua)) hang cong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((nhieu tang) OR (hieu quan)) - hanh ((tranh cua) OR (manh cua)) hang cong van toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((nhieu tang) or (hieu quan)) - hanh ((tranh cua) OR (manh cua)) hang cong van toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((nhieu tang) or (hieu quan)) - hanh ((tranh cua) OR (manh cua)) hang cong van toan ban*.