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 » doc hieu, doi chi, mot chieu
dung tong » dung thong, dung cong, dung dong
luan phan » luan van, luan hoan
ho chieu » theo chieu, hoc thieu, mot chieu

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