Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ty » sach y, sach tu, sach thu
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
nang co » nang cao, nang doc, nang noi
ty nang » ky nang, ty xang, ty hang
cac bo » bac bo, cac co
co hai » co dai, co hoi, o hai
cac so » cac co, cac ho, cac o

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang co hai. hieu van ((cac so) or (cac bo)) van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang co hai. hieu van ((cac so) OR (cac bo)) van hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang co hai. hieu van ((cac so) or (cac bo)) van hanh vai cua tre*.