Perhaps you should try some spelling variations:
thanh tung » thanh cong
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
ho chieu » theo chieu, hoc thieu, doi chieu
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
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: ((doc hieu) OR (ho chieu)) tinh - thanh tung cua dung cong san ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (ho chieu)) tinh - thanh tung cua dung cong san ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (ho chieu)) tinh - thanh tung cua dung cong san ((toan cau) OR (toan ban))*.