Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hanh tranh » canh tranh, hanh trinh, hanh trang
doi chieu » doc hieu, ho chieu, mot chieu
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
van toan » van tuan, van tan, van thanh
toan ban » van ban
doi chi » doi khi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (doi chi)) xanh - hanh tranh va ((nhung cong) OR (dung cong)) van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) xanh - hanh tranh va ((nhung cong) OR (dung cong)) van toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doi chi)) xanh - hanh tranh va ((nhung cong) OR (dung cong)) van toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) xanh - hanh tranh va ((nhung cong) OR (dung cong)) van toan ban*.