Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
van anh » van thanh, tuan anh, van minh
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
_ lang » o lang, _ land
va cam » va cham, va cac, va cao
y lang » o lang, tay lang, yen lang
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 (_ lang)) xa hoi. hieu va cam tuc van anh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((y lang) or (_ lang)) xa hoi. hieu va cam tuc van anh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((y lang) or (_ lang)) xa hoi. hieu va cam tuc van anh vi cua tre*.