Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » vu sach
va hanh » van hanh, va thanh, va danh
cac toc » cac toi, cac nuoc, cac thoi
van cac » van hac, van cau, van bac
ly nang » ky nang, ly hang, ly vang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
toc va » hoc va, toc ta, tuc 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 (so sach)) ((y nang) or (ly nang)) xa hoi. hieu van cac toc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ((y nang) OR (ly nang)) xa hoi. hieu van cac toc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ((y nang) or (ly nang)) xa hoi. hieu van cac toc va hanh vi cua tre*.