Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
hanh tranh » canh tranh, hanh trinh, hanh trang
thong cong » trong cong, tong cong, thong thong
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh cua » doanh cua, manh cua
doc hieu » toc thieu, hoc thieu, hoc hien
van tuan » van quan, anh tuan

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 xanh - hanh tranh cua ((nhung cong) or (thong cong)) ((van tuan) OR (van ban)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh tranh cua ((nhung cong) OR (thong cong)) ((van tuan) OR (van ban)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh tranh cua ((nhung cong) or (thong cong)) ((van tuan) OR (van ban)) tu".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh tranh cua ((nhung cong) or (thong cong)) ((van tuan) OR (van ban)) tu*.