Perhaps you should try some spelling variations:
doanh luan » doanh nhan
nhung cong » dung cong, thong cong, hang cong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
tranh cua » doanh cua, manh cua
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
phan cau » phan dau, phan cac, phan lap

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 - canh ((tranh cua) or (doanh luan)) nhung cong tan ((phan cau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - canh ((tranh cua) OR (doanh luan)) nhung cong tan ((phan cau) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - canh ((tranh cua) or (doanh luan)) nhung cong tan ((phan cau) or (phan tu))*.