Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, kieu tinh
trang cua » tranh cua, tang cua, thang cua
trung cua » truong cua, trung tuan, trung cap
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac

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 tinh - hanh ((trang cua) OR (trung cua)) trong cong tac ((than cap) OR (khan cap))~.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - hanh ((trang cua) or (trung cua)) trong cong tac ((than cap) or (khan cap))*.