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
dang cong » dung cong
hang van » hoang van, hang va, dang van
van dang » van dong, van dung, van nang
cong dan » cong san, cong tan, huong dan
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh hang van dang cong dan ((than cau) OR (phan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh hang van dang cong dan ((than cau) OR (phan cau))*.