Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, hieu binh
kieu tinh » lieu tinh, trieu tinh, diep tinh
tranh cua » doanh cua, manh cua
hang nong » thang long, han tong
khoan cam » khoa cam, khoan va, phan cam
cua hang » cua dang, cua nhung, cua cong
nong tac » cong tac, dong tac, nong tan
nhan cua » nhat cua, nhan luc, nhan su

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 (kieu tinh)) - canh tranh cua hang nong tac ((nhan cua) or (khoan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (kieu tinh)) - canh tranh cua hang nong tac ((nhan cua) OR (khoan cam)).
• Adding a wildcard symbol may retrieve word variants: doc ((hieu tinh) or (kieu tinh)) - canh tranh cua hang nong tac ((nhan cua) or (khoan cam))*.