Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
qua cham » qua hai, qua cac, va cham
cham xuc » cam xuc, chat xuc, cham soc
van hanh » ban hanh, van anh, van ban
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
cao hoi » cau hoi, cao hoc, tao hoi
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty xang ((cao hoi) or (co hoi)). hieu qua cham xuc ((van hanh) or (van thanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty xang ((cao hoi) OR (co hoi)). hieu qua cham xuc ((van hanh) OR (van thanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty xang ((cao hoi) or (co hoi)). hieu qua cham xuc ((van hanh) or (van thanh)) di cua tre*.