Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
van hanh » ban hanh, van anh, van ban
nang dau » hang dau, xang dau, nang du
sach kem » hanh kem
cac xuc » cam xuc, cac nuoc, chat xuc
tai cua » thai cua, tai cuc, tri cua
van cac » van hac, van cau, van bac
dau hoi » cau hoi, dai hoi, dan hoi
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet

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 kem) or (sach ty)) nang dau hoi. hieu van cac xuc ((van hanh) or (van thanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kem) OR (sach ty)) nang dau hoi. hieu van cac xuc ((van hanh) OR (van thanh)) tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sach ty)) nang dau hoi. hieu van cac xuc ((van hanh) or (van thanh)) tai cua tre*.