Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, mot chieu
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, hoc thieu, mot chieu
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
chanh tu » nhanh tu, thanh tu, chinh tu
va hang » van hang, va nang, va lang
hanh tu » anh tu, danh tu

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