Perhaps you should try some spelling variations:
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
sach tu » sach thu, sach ty, sach uu
xuc ban » duc ban, cuc ban, quoc ban
nam xuc » cam xuc, nam xua, nam thuc
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
cach tu » cach thuc
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: tu ((sach tu) or (cach tu)) ((nang ma) or (nang x)) hoi. hieu van nam xuc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (cach tu)) ((nang ma) OR (nang x)) hoi. hieu van nam xuc ban hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (cach tu)) ((nang ma) or (nang x)) hoi. hieu van nam xuc ban hanh vi cua tre*.