Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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: doc hieu xanh - thanh ((trung va) OR (trung ha)) hang cong ((van toan) OR (van tan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - thanh ((trung va) OR (trung ha)) hang cong ((van toan) or (van tan)) cao~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh ((trung va) OR (trung ha)) hang cong ((van toan) or (van tan)) cao*.