Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
tu nano » truc nano
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
va hoi » xa hoi, va hoc, va hoa
ve cac » va cac, vien cac

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) or (co sach)) tu nano va hoi. hieu ve cac ((duc va) or (tuc xa)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) tu nano va hoi. hieu ve cac ((duc va) OR (tuc xa)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) tu nano va hoi. hieu ve cac ((duc va) or (tuc xa)) hanh vai cua tre*.