Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
cac xuc » cam xuc, cac nuoc, chat xuc
van cac » van hac, van cau, van bac
su sach » so sach, vu sach
nang ho » nang hoc, nang co, tang ho
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ro, nang x
xuc va » duc va, tuc va, luc va
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: ((su sach) or (toc sach)) ky ((nang o) OR (nang ho)) hoi. hieu van cac xuc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) ky ((nang o) OR (nang ho)) hoi. hieu van cac xuc va thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (toc sach)) ky ((nang o) OR (nang ho)) hoi. hieu van cac xuc va thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (toc sach)) ky ((nang o) OR (nang ho)) hoi. hieu van cac xuc va thanh vi cua tre*.