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
dap nhung » vap nhung, va nhung, dap ung
tung dap » tung dan, trung dai, tuong dan
cong san » cong tac
cong tan » cong tac, cong thanh, cong ty
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.

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