Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu va » lieu va, hieu qua
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
hau tuc » cau truc, hieu tuc, thai tuc
tu sach » thu sach, su sach, te sach
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
va hau » van hau, va chau, vat hau
tuc va » thuc va, truc va, tuc xa
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: tu sach y nang ((((5 hoi) or (o hoi))) or (xa hoi)). hieu va hau tuc va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((((5 hoi) OR (o hoi))) OR (xa hoi)). hieu va hau tuc va hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((((5 hoi) or (o hoi))) or (xa hoi)). hieu va hau tuc va hanh vai cuu tre*.