Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
thanh vi » hanh vi, thanh ve, nhanh vi
vu sach » vu bach, su sach, vu khach
cac toc » cac toi, cac nuoc, cac thoi
qua cac » cua cac
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
toc va » hoc va, toc ta, tuc va
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: ((vu sach) or (so sanh)) cam nang x hoi. hieu qua cac toc va ((thanh vi) OR (thanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sanh)) cam nang x hoi. hieu qua cac toc va ((thanh vi) OR (thanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sanh)) cam nang x hoi. hieu qua cac toc va ((thanh vi) OR (thanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sanh)) cam nang x hoi. hieu qua cac toc va ((thanh vi) OR (thanh va)) cua tre*.