Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
trung vat » trung va, trong vat, truong van
trung van » truong van, trung va, trung tuan
trong van » trong cac
thanh cau » thanh chau, nhanh cau, thanh ca
thanh mau » hanh mau, thanh san, thanh hai

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 vat) OR (trung van)) dung trong van ((thanh cau) or (thanh mau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh ((trung vat) OR (trung van)) dung trong van ((thanh cau) OR (thanh mau))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - thanh ((trung vat) OR (trung van)) dung trong van ((thanh cau) or (thanh mau))*".