Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
cong tang » cong thang, cong tan, cong lang
ho chieu » theo chieu, hoc thieu, mot chieu
tranh va » tranh van, trang va, trinh va
tang van » dang van, hoang van, trong van
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((ho chieu) or (doi chieu))) or (theo tieu)) xanh - canh tranh va dung cong tang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((ho chieu) OR (doi chieu))) OR (theo tieu)) xanh - canh tranh va dung cong tang van ban.
• Adding a wildcard symbol may retrieve word variants: ((((ho chieu) or (doi chieu))) or (theo tieu)) xanh - canh tranh va dung cong tang van ban*.