Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
te sach » toc 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: te sach ky nang xa hoi. hieu van cau ((luc va) OR (duc va)) hanh di ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu van cau ((luc va) or (duc va)) hanh di ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu van cau ((luc va) or (duc va)) hanh di ((cua triet) OR (cua viet))*.