Perhaps you should try some spelling variations:
cao thuc » cao thuoc, bao thuc, can thuc
vat hanh » vat thanh, van hanh, va hanh
ban hanh » ban hang
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu va cao thuc ((vat hanh) or (ban hanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu va cao thuc ((vat hanh) OR (ban hanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu va cao thuc ((vat hanh) or (ban hanh)) di cua tre*.