Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
mot chieu » doi chieu, ho chieu
lang cong » dang cong, bang cong, hang cong
doc hieu » toc thieu, hoc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
va lang » va nang, hoa lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((mot chieu) or (doc hieu)) xanh - canh trinh va lang cong dan ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (doc hieu)) xanh - canh trinh va lang cong dan ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (doc hieu)) xanh - canh trinh va lang cong dan ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (doc hieu)) xanh - canh trinh va lang cong dan ((toan cau) OR (toan ban))*.