Perhaps you should try some spelling variations:
tranh chuan » trinh chuan, tranh chua, tranh cua
chuan nang » chua nang, chuan trang, chuc nang
doi chieu » doi chi, mot chieu, thi chieu
nang cong » nang song, dang cong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
ho chieu » theo chieu, hoc thieu, mot chieu
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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

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