Perhaps you should try some spelling variations:
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va bao » va bai
bao do » ban do, dao do, cao do
va cua » va chua, via cua, ma cua
ca cua » co cua
do va » do van, 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 do va hanh ((va cua) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang cao hoi. lieu va bao do va hanh ((va cua) OR (ca cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoi. lieu va bao do va hanh ((va cua) or (ca cua)) tre*.