Perhaps you should try some spelling variations:
thanh tinh » thanh binh, nhanh tinh, than kinh
hieu quan » hieu qua, lieu quan, thien quan
hang cong » dang cong, hang nong, bang cong
tinh cua » trinh cua, sinh cua, tinh chat
cua hang » cua dang, cua nhung, cua cong
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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 - thanh tinh cua hang cong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quan - thanh tinh cua hang cong dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: ho hieu quan - thanh tinh cua hang cong dan ((toan cao) or (toan ban))*.