Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh quan » tinh quang, trinh luat, trinh han
doi chieu » doi chi, ho chieu, mot chieu
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
luan phan » luan hoan
doc hieu » toc thieu, hoc thieu, hoc hien

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

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