Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
tranh cua » doanh cua, manh cua
hang nong » thang long, han tong
doc hieu » toc thieu, hoc thieu, hoc hien
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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