Perhaps you should try some spelling variations:
cuong dung » tuong duong, ung dung, thong dung
hanh trang » thanh trung, canh tranh, hanh trinh
hieu quan » hieu qua, lieu quan, thien quan
cong dung » cong dong, cong luong, thong dung
hoc hieu » hoc thieu, hoc hien, doc hieu
hoa lang » hoa dan, hoa van
toan ban » van ban
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu quan - hanh trang ((va hang) or (hoa lang)) ((cong dung) or (cuong dung)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quan - hanh trang ((va hang) OR (hoa lang)) ((cong dung) OR (cuong dung)) toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu quan - hanh trang ((va hang) or (hoa lang)) ((cong dung) or (cuong dung)) toan ban*.