Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
doi chieu » doc hieu, doi chi, mot chieu
nang cong » nang song, dang cong, bang cong
ho chieu » theo chieu, hoc thieu, mot chieu
tran van » luan van
van nang » van quang, van ban, van dong
cong san » cong tac
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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) OR (doi chieu)) xanh - thanh tran van nang cong san ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) xanh - thanh tran van nang cong san ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - thanh tran van nang cong san ((toan cau) OR (toan ban))*.