Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tren
cac thuc » cach thuc, cac thu, can thuc
hanh vai » hanh vi, hanh va, hanh tai
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
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: te ((sach tru) or (sach tu)) nang x hoi. hieu va cac thuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tru) OR (sach tu)) nang x hoi. hieu va cac thuc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach tru) or (sach tu)) nang x hoi. hieu va cac thuc va hanh vai cua tre*.