Perhaps you should try some spelling variations:
vanh tai » van tai, hanh tai, anh tai
van vanh » van anh, van hanh, van manh
sach ky » sac ky, sach ty, sach kem
tai cua » thai cua, tai cuc, tri cua
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
co hai » co dai, co hoi, so hai
ve cac » va cac, vien cac
o hai » so hai, o lai, _ hai

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 ky) OR (sach y)) nang ((o hai) or (co hai)). hieu ve cac xuc van vanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ((o hai) OR (co hai)). hieu ve cac xuc van vanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) nang ((o hai) or (co hai)). hieu ve cac xuc van vanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) nang ((o hai) or (co hai)). hieu ve cac xuc van vanh tai cua tre*.