Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cham thuc » nham thuc, pham thuc, tham thuc
thanh ve » hanh ve, thanh va, thanh vien
sach thu » sach thue, sach thieu, sach tham
thuc ban » thuoc ban, thuc dan, thu ban
va cham » va chat, va tham
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, xach tay
hang ma » hang va, hang ca, tang ma
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua

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

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