Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
cung dap » cung cap, cuong dao, dung dat
cung dat » dung dat, vung dat, cuong dao
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap

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