Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
hien sach » dien sach, kien sach, thien hach
trong van » trong cac
van nhung » van nhuong, va nhung, van hung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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 hien sach - thanh trong van nhung ((cong dan) OR (cong san)) ((toan cau) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien sach - thanh trong van nhung ((cong dan) OR (cong san)) ((toan cau) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - thanh trong van nhung ((cong dan) OR (cong san)) ((toan cau) or (toan cao))*.