Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh quan » tinh quang, trinh luat, trinh han
trong luan » truong luan, tong luan, thong luan
trong quan » thong quan, tong quan, thong quang
hoc thieu » toc thieu, hoc hien
quan dung » quang dung, quan duong, qua dung
ho chieu » theo chieu, doi chieu, 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 (hoc thieu)) xanh - canh trinh quan dung ((trong luan) OR (trong quan)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - canh trinh quan dung ((trong luan) OR (trong quan)) phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - canh trinh quan dung ((trong luan) OR (trong quan)) phan tu".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - canh trinh quan dung ((trong luan) OR (trong quan)) phan tu*.