Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
ly nang » ky nang, ly vang, ly quang
ly hang » ly quang
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
va cau » van cau, va cac, va dau
xuc va » duc va, tuc va, luc va
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ly hang)) x hoi. hieu va cau ((xuc va) OR (tuc xa)) hanh dai cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) OR (ly hang)) x hoi. hieu va cau ((xuc va) or (tuc xa)) hanh dai cua vat~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) OR (ly hang)) x hoi. hieu va cau ((xuc va) or (tuc xa)) hanh dai cua vat*.