Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, hien hanh
cong sang » cong san, cong vang, cong bang
cong lang » cong vang, cong luong, cong quang
than cap » khan cap, thanh lap, thanh cac
tung va » trung va, tuong va, dung va
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 manh) OR (dieu hanh)) - thanh tung va hang ((cong sang) or (cong lang)) than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (dieu hanh)) - thanh tung va hang ((cong sang) OR (cong lang)) than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (dieu hanh)) - thanh tung va hang ((cong sang) or (cong lang)) than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (dieu hanh)) - thanh tung va hang ((cong sang) or (cong lang)) than cap*.