Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
doi chieu » doi chi, ho chieu, mot chieu
tranh vat » trinh vat, tranh va, tranh van
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
vat dung » van dung, va dung, viet dung
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, 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: ((doi chieu) or (doc hieu)) xanh - hanh tranh vat dung cong ((van toan) OR (van tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) xanh - hanh tranh vat dung cong ((van toan) OR (van tuan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doc hieu)) xanh - hanh tranh vat dung cong ((van toan) OR (van tuan)) ban".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) xanh - hanh tranh vat dung cong ((van toan) OR (van tuan)) ban*.