Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
toan cao » toan tap
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: hoc hieu manh - canh tranh cua ((nhung cong) or (hang cong)) san ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh cua ((nhung cong) OR (hang cong)) san ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh cua ((nhung cong) or (hang cong)) san ((toan cao) or (toan ban))*.