Perhaps you should try some spelling variations:
dieu cua » dieu tra
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
su sach » so sach, vu sach
so sanh » do sanh
cac toc » cac toi, cac nuoc, cac thoi
cua tre » cua te, cuu tre, cua triet
toc va » hoc va, toc ta, tuc va
va cua » va chua, via cua, ca 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)) cam nang x hoi. dieu cua cac toc va thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) cam nang x hoi. dieu cua cac toc va thanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) cam nang x hoi. dieu cua cac toc va thanh va cua tre*.