Perhaps you should try some spelling variations:
hien tach » thien hach, chiet tach, vien bach
hanh tran » hanh trang, thanh tran, hanh tram
van nhung » van nhuong, va nhung, van hung
tran van » luan van
cong dan » cong tan, cong dong, cong tac
cong san » cong tac
than cau » toan cau, phan cau, than cap

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