Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
hang ca » nang cao, hang tai, hang dau
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh va » hanh vi
su tien » su kien, su hien, tu tieng

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((hang ca) or (hang va)) hoi. hieu ve cham thuc va hanh va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((hang ca) OR (hang va)) hoi. hieu ve cham thuc va hanh va su tien.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((hang ca) or (hang va)) hoi. hieu ve cham thuc va hanh va su tien*.