Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trung » thanh trung, hanh trang, manh trung
cong thanh » dong thanh, cong trinh, truong thanh
hieu van » hieu va, thien van, lieu va
trung ha » trung hoc, trung tam, trung cap
cong tan » cong tac, cong san, cong ty
toan cao » toan ban, toan tap
ha hang » nha hang, ha tang, va hang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu van) OR (hieu quang)) - hanh trung ha hang ((cong thanh) OR (cong tan)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu van) or (hieu quang)) - hanh trung ha hang ((cong thanh) OR (cong tan)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu van) or (hieu quang)) - hanh trung ha hang ((cong thanh) OR (cong tan)) toan cao*.