Perhaps you should try some spelling variations:
bien tinh » bi tinh, yen tinh, diep tinh
dung cong » dung trong
doi bien » doi dien, voi bien, doi hien
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi bien tinh - thanh ((trung va) or (trung ha)) dung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi bien tinh - thanh ((trung va) OR (trung ha)) dung cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: doi bien tinh - thanh ((trung va) or (trung ha)) dung cong dan toan cao*.