Perhaps you should try some spelling variations:
thanh trung » thanh tung
lieu tinh » trieu tinh, diep tinh, bien tinh
hoc lieu » hoc dieu, hoc sieu, hoc tieu
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
toan cao » toan ban
toan tap » toan ban
va dung » van dung, va duong, vat dung

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: hoc lieu tinh - thanh trung va dung ((cong dan) OR (cong tac)) ((toan cao) OR (toan tap))~.
• Adding a wildcard symbol may retrieve word variants: hoc lieu tinh - thanh trung va dung ((cong dan) or (cong tac)) ((toan cao) or (toan tap))*.