Perhaps you should try some spelling variations:
su sach » so sach
vu sach » vu bach, vu khach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
bai so » dai so, tai so, hai so
va anh » van anh, va danh, va hanh
anh va » hanh va
va cua » va chua, via cua, ca cua
cua te » cua tu
so va » so van, so vat, su 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) or (vu sach)) y nang cao hoi. hieu va bai so va anh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang cao hoi. hieu va bai so va anh va cua te.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang cao hoi. hieu va bai so va anh va cua te*.