Perhaps you should try some spelling variations:
thanh vi » thanh va, thanh ve, nhanh vi
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ban bo » can bo, ban do, ban co
bo van » vo van, so van, do van
ve ban » te ban, va ban, ve bao
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: tu ((sach ky) or (sach y)) nang x hoi. hieu ve ban bo van ((thanh vi) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang x hoi. hieu ve ban bo van ((thanh vi) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang x hoi. hieu ve ban bo van ((thanh vi) or (hanh vi)) cua tre*.