Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuat bai » thuat bao, thuyet bai, thuat xay
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (((thuoc sach) or (thuat bai)))) ky lang xa hoi. hieu ve cac xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((thuoc sach) OR (thuat bai)))) ky lang xa hoi. hieu ve cac xuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((thuoc sach) or (thuat bai)))) ky lang xa hoi. hieu ve cac xuc van hanh vi cua tre*.