Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
hanh di » hanh vi, hanh de, hang di
luc va » tuc va, loc va

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 ky nang xa hoi. hieu van cau ((luc va) OR (duc va)) hanh di ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu van cau ((luc va) or (duc va)) hanh di ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van cau ((luc va) or (duc va)) hanh di ((cua triet) OR (va triet))*.