Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
trinh cua » tinh cua, trinh luat, trinh luan
ho chieu » theo chieu, hoc thieu, doi chieu
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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: ho chieu xanh - hanh ((trinh cua) OR (trinh quan)) nhung cong ((van toan) OR (van tan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - hanh ((trinh cua) or (trinh quan)) nhung cong ((van toan) OR (van tan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - hanh ((trinh cua) or (trinh quan)) nhung cong ((van toan) OR (van tan)) cau*.