Perhaps you should try some spelling variations:
tuan tai » toan tai, quan tai, tan tai
van tuan » van quan, van ban, anh tuan
hieu ve » hieu va, hieu van
tai cua » thai cua, tai cuc, tri cua
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
smo hoc » so hoc
cua tre » cua te, cuu tre, cua triet
co hai » co dai, co hoi, o hai
ve cac » va cac, vien cac
mo hoc » mon hoc, co hoc

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 nang ((((mo hoc) or (smo hoc))) or (co hai)). hieu ve cac xuc van tuan tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((((mo hoc) OR (smo hoc))) OR (co hai)). hieu ve cac xuc van tuan tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((((mo hoc) or (smo hoc))) or (co hai)). hieu ve cac xuc van tuan tai cua tre*.