Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, mot chieu
trinh qua » trinh quan, trinh cua, trinh quang
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, mot chieu
thi hieu » thi chieu, thi hien, thi dieu
qua dung » quang dung, su dung, qua song
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 (thi hieu)) xanh - canh trinh qua dung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((ho chieu) OR (doi chieu))) OR (thi hieu)) xanh - canh trinh qua dung cong dan toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((ho chieu) OR (doi chieu))) or (thi hieu)) xanh - canh trinh qua dung cong dan toan cau*".