Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
cao hoi » cau hoi, co hoi, cao hoc
va cham » va chat, va tham
xuc van » duc van, luc van, vuc van
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam

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 nang cao hoi. hieu ((ve cam) or (va cham)) xuc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang cao hoi. hieu ((ve cam) OR (va cham)) xuc van hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang cao hoi. hieu ((ve cam) or (va cham)) xuc van hanh tai cua tre*.