Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang ho » nang hoc, nang co, tang ho
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, xuc ban
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ro, nang x
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((nang o) or (nang ho)) hoi. hieu ve cac xuc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang o) OR (nang ho)) hoi. hieu ve cac xuc van hanh tai cua tre*.