Perhaps you should try some spelling variations:
hanh vin » hanh tin, hanh van, thanh vien
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu tang » tuc tang, tu trang, tu tong
tang ma » mang may, tang van
qua cau » quan cau, qua cac, qua ca
cau xuc » cam xuc, cau luc, cau truc
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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 tu tang ma hoi. hieu qua cau xuc van ((hanh vin) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu tang ma hoi. hieu qua cau xuc van ((hanh vin) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tu tang ma hoi. hieu qua cau xuc van ((hanh vin) or (hanh vi)) cua tre*.