Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
hanh hang » thanh hang, hang hang, hanh han
hang van » hoang van, hang va, dang van
van dang » van dong, van dung, van nang
cong dan » cong tan, huong dan, cong dong
cong tac » cong ty
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 thieu sach - hanh hang van dang ((cong dan) OR (((cong san) OR (cong tac)))) than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh hang van dang ((cong dan) or (((cong san) OR (cong tac)))) than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh hang van dang ((cong dan) or (((cong san) OR (cong tac)))) than cau*.