Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sang mai » sang ma, sang tai, lang mai
va thanh » ban thanh, va tinh, le thanh
cam tuc » cam xuc, cam tu, nam thuc
hai cua » thai cua, dai cua, hoi cua
qua cam » qua cham, qua cac, qua ca
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
v sang » va sang, ve sang, _ sang

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) or (toc sach)) v sang mai hoi. hieu qua cam tuc ((va thanh) or (gia thanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v sang mai hoi. hieu qua cam tuc ((va thanh) OR (gia thanh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) v sang mai hoi. hieu qua cam tuc ((va thanh) or (gia thanh)) hai cua tre*.