Perhaps you should try some spelling variations:
bo sach » co sach, hoc sach
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
vu sach » vu bach, su sach, vu khach
ve cac » va cac, vien cac
lo van » le van, vo van, so van
va cua » va chua, via cua, ca cua
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 ve cac ((lo va) or (lo van)) hanh va 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 ve cac ((lo va) OR (lo van)) hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (vu sach)) ky nang x hoi. hieu ve cac ((lo va) or (lo van)) hanh va cua tre*.