Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hang vi » hang va, hanh vi, khang voi
so sach » so sanh, bo sach, co sach
tuc van » thuc van, truc van, tuc va
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
hang di » hang doi, hang dien, hang dich
y nang » ky nang, ly nang, v nang

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: so sach y nang xa hoi. hieu va cac tuc van ((hang di) OR (hang vi)) ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. hieu va cac tuc van ((hang di) or (hang vi)) ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. hieu va cac tuc van ((hang di) or (hang vi)) ((cua triet) OR (va triet))*.