Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hang di » hang doi, hang vi, hang dien
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
qua cam » qua cham, qua cac, qua ca
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet

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: ((toc sach) OR (hoc sach)) ty nang xa hoi. hieu qua cam tuc van ((hang di) OR (hanh vi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ty nang xa hoi. hieu qua cam tuc van ((hang di) or (hanh vi)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ty nang xa hoi. hieu qua cam tuc van ((hang di) or (hanh vi)) cua tre*.