Perhaps you should try some spelling variations:
ban thinh » ban thanh, ban tinh, van thinh
thinh le » trinh ly
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
tuc ban » thuc ban, truc ban, tu ban
hieu ve » hieu va
sach ty » sach y, sach tu, xach tay
cam tuc » cam xuc, cam tu, nam thuc
le cua » ly cua
va hoi » xa hoi, va hoc, va hoa

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