Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh le » thinh le, thanh ve, thanh de
sach thu » sach thue, sach thieu, sach tham
tuc ban » thuc ban, truc ban, tu ban
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
van hoc » van hoa
sach ty » sach y, sach tu, xach tay
ve cam » ve cham, ve cac, va cam
le cua » ly cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach thu)) hang ((va hoc) OR (van hoc)). hieu ve cam tuc ban thanh le cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) hang ((va hoc) OR (van hoc)). hieu ve cam tuc ban thanh le cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach thu)) hang ((va hoc) OR (van hoc)). hieu ve cam tuc ban thanh le cua vat".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) hang ((va hoc) OR (van hoc)). hieu ve cam tuc ban thanh le cua vat*.