Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, kieu tinh
tranh cua » doanh cua, manh cua
dang cong » dung cong
cua dang » cua cong, cua ban
cong tac » cong ty
nhan cua » nhat cua, nhan luc, nhan su
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu tinh) or (diep tinh)) - canh tranh cua dang cong tac ((nhan cua) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (diep tinh)) - canh tranh cua dang cong tac ((nhan cua) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: doc ((hieu tinh) or (diep tinh)) - canh tranh cua dang cong tac ((nhan cua) or (khan cap))*.