Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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