Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
doi chieu » doc hieu, doi chi, ho chieu
trinh cua » tinh cua, trinh luat, trinh luan
dung cong » dung trong
theo chu » theo chieu, cho chu, chao chu
cong san » cong tac
san van » tan van, luan van, tran van

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: ((theo chu) OR (doi chieu)) xanh - hanh ((trinh cua) OR (trinh quan)) dung cong san van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chu) or (doi chieu)) xanh - hanh ((trinh cua) OR (trinh quan)) dung cong san van ban~".
• Adding a wildcard symbol may retrieve word variants: ((theo chu) or (doi chieu)) xanh - hanh ((trinh cua) OR (trinh quan)) dung cong san van ban*.