Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
su sach » vu sach
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
so sach » so sanh, bo sach, co sach
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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 (so sach)) ky nang ((x hoi) OR (o hoi)). hieu va cam tu va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang ((x hoi) OR (o hoi)). hieu va cam tu va hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang ((x hoi) OR (o hoi)). hieu va cam tu va hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang ((x hoi) OR (o hoi)). hieu va cam tu va hanh vai cuu tre*.