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
cam thuc » am thuc, nam thuc, cam thu
thuc ban » thuoc ban, thuc dan, thu ban
thinh le » trinh ly
sach ty » sach y, sach tu, xach tay
van cam » van nam, van lam, van cau
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 thuc 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 van cam thuc 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 thuc ban thinh le cua vat*.