Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
hang mang » hang hang, hang mong, hanh mang
mang cua » manh cua, dung cua, ban cua
cua dang » cua cong, cua ban
cong dan » cong tan, huong dan, cong tac
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - hang mang cua dang ((((cong dan) OR (cong dong))) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hang mang cua dang ((((cong dan) OR (cong dong))) OR (cong san)) toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hang mang cua dang ((((cong dan) OR (cong dong))) or (cong san)) toan cao*".