Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
thanh cac » hanh cac, thanh bac, thanh ca
cong dan » cong tan, huong dan, cong dong
cong san » cong 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 thieu sach - thanh ((trung cua) OR (trung cap)) nhung ((cong dan) OR (cong san)) thanh cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - thanh ((trung cua) OR (trung cap)) nhung ((cong dan) or (cong san)) thanh cac~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh ((trung cua) OR (trung cap)) nhung ((cong dan) or (cong san)) thanh cac*.