Perhaps you should try some spelling variations:
thien anh » thien danh, thien thanh, thien chanh
thanh ung » thanh tung, thanh hung, thanh dung
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
tien anh » tieng anh, tien manh, dien anh
tac dung » sach dung, xay dung, tin dung
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
ung tac » tuong tac, huong tac, muong tac

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: hoc ((thien anh) OR (tien anh)) - thanh ung tac dung cong manh ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) or (tien anh)) - thanh ung tac dung cong manh ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) or (tien anh)) - thanh ung tac dung cong manh ((toan cau) OR (toan ban))*.