Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
bo sach » co sach, hoc sach
vai cua » dai cua, hai cua, lai cua
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
vu sach » vu bach, su sach, vu khach
lo van » le van, vo van, so van
x hoi » xa hoi, o hoi, x ho
lo va » lao va, ly va, le va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((bo sach) or (vu sach)) ky nang x hoi. hieu van cac ((lo va) or (lo van)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (vu sach)) ky nang x hoi. hieu van cac ((lo va) OR (lo van)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (vu sach)) ky nang x hoi. hieu van cac ((lo va) or (lo van)) hanh vai cua tre*.