Perhaps you should try some spelling variations:
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va bao » va bai
va cua » va chua, via cua, ca cua
bo va » bao va, do va, so va

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 y nang cao hoi. lieu va bao ((bo va) or (tao va)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang cao hoi. lieu va bao ((bo va) OR (tao va)) hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoi. lieu va bao ((bo va) or (tao va)) hanh va cua tre*.