Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
tung vat » dung vat, tung va, luong vat
tang vat » tang van, dang vat, bang vat
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
thai cao » tai cao, thoai cac, thuat cao

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