Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
hieu va » lieu va, hieu qua
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
va nam » van nam, ha nam, va nay
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((y lang) OR (_ land)) xa hoi. hieu va nam thuc van anh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((y lang) or (_ land)) xa hoi. hieu va nam thuc van anh vi cua tre*.