Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien hanh » dieu hanh
cong nhan » cong nhat, cong thanh, dung nhan
dien anh » tieng anh, dien dan
trung ha » trung hoc, trung tam, trung cap
cong san » cong tac
ha hang » nha hang, ha tang, va hang
tan cao » toan cao, tao cao, tay cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((dien anh) or (hien hanh)) - thanh trung ha hang ((cong nhan) OR (cong san)) tan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dien anh) OR (hien hanh)) - thanh trung ha hang ((cong nhan) OR (cong san)) tan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((dien anh) or (hien hanh)) - thanh trung ha hang ((cong nhan) OR (cong san)) tan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((dien anh) or (hien hanh)) - thanh trung ha hang ((cong nhan) OR (cong san)) tan cao*.