Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
cam hung » cac chung, cam nang, van hung
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
khan cap » khan ap, than cap, khoan cam

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 - ((thanh trung) or (thanh tung)) cam hung ((cong dan) OR (cong tan)) khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - ((thanh trung) OR (thanh tung)) cam hung ((cong dan) OR (cong tan)) khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - ((thanh trung) or (thanh tung)) cam hung ((cong dan) OR (cong tan)) khan cap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - ((thanh trung) or (thanh tung)) cam hung ((cong dan) OR (cong tan)) khan cap*.