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