Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, mot chieu
trinh va » trinh van, trinh vat, trinh ve
cong hai » cong thai, cong ha, hoang hai
va dung » van dung, va duong, vat dung
quan ao » quang cao, quang bao, quan doi
quan so » quan su, quan doi, quan sat

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)) xanh - canh trinh va dung cong hai ((quan ao) OR (quan so))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - canh trinh va dung cong hai ((quan ao) OR (quan so)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) xanh - canh trinh va dung cong hai ((quan ao) OR (quan so))".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - canh trinh va dung cong hai ((quan ao) OR (quan so))*.