Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
qua cham » qua hai, qua cac, va cham
cham xuc » cam xuc, chat xuc, cham soc
ban hanh » ban hang
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
y dang » ky dang, 2 dang, b dang
_ dang » _ dan, 2 dang, _ danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((y dang) OR (_ dang)) xa hoi. hieu qua cham xuc ban hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((y dang) OR (_ dang)) xa hoi. hieu qua cham xuc ban hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((y dang) OR (_ dang)) xa hoi. hieu qua cham xuc ban hanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((y dang) OR (_ dang)) xa hoi. hieu qua cham xuc ban hanh vi ((cua tre) or (cuu tre))*.