Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
lang ha » long ha
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
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 y ((sang ma) or (lang ha)) hoi. hieu ve cac xuc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((sang ma) OR (lang ha)) hoi. hieu ve cac xuc ban hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((sang ma) or (lang ha)) hoi. hieu ve cac xuc ban hanh vi cua tre*.