Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
lam thuc » lam thuoc, am thuc, nam thuc
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
van lam » van nam
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma 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) OR (su sach))) or (thuoc sach)) ky nang ma hoi. hieu van lam thuc va hanh dai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (su sach))) OR (thuoc sach)) ky nang ma hoi. hieu van lam thuc va hanh dai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (su sach))) or (thuoc sach)) ky nang ma hoi. hieu van lam thuc va hanh dai cua vat".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (su sach))) or (thuoc sach)) ky nang ma hoi. hieu van lam thuc va hanh dai cua vat*.