Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
tuoc va » thuoc va, nuoc va, duoc va
van hac » van hoc, van ha, van hai
van bac » van ban, van bao, dan bac
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
so sanh » do sanh
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 sanh)) v nang x hoi. thien ((van bac) or (van hac)) tuoc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) v nang x hoi. thien ((van bac) OR (van hac)) tuoc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) v nang x hoi. thien ((van bac) or (van hac)) tuoc va hanh vi cua tre*.