Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu nganh » vien nganh, hiem ngan, hieu manh
cong nang » cong ngang, cong nong, cong vang
cong lang » cong vang, cong luong, cong quang
trung ha » trung hoc, trung tam, trung cap
thanh tu » hanh tu, nhanh tu, thanh tung
ha hang » nha hang, ha tang, va hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((dieu hanh) or (hieu nganh)) - thanh trung ha hang ((cong nang) OR (cong lang)) thanh tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((dieu hanh) OR (hieu nganh)) - thanh trung ha hang ((cong nang) OR (cong lang)) thanh tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((dieu hanh) or (hieu nganh)) - thanh trung ha hang ((cong nang) OR (cong lang)) thanh tu".
• Adding a wildcard symbol may retrieve word variants: doc ((dieu hanh) or (hieu nganh)) - thanh trung ha hang ((cong nang) OR (cong lang)) thanh tu*.