Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hieu van » hieu va, thien van, hieu ve
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cau luc » cau truc, cau phuc
va danh » va dinh, va dan, va hanh
danh de » hanh de, dan de, dang de
y nang » ky nang, ly nang, v nang
luc va » duc 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 y nang xa hoi. ((hieu van) OR (lieu va)) cau luc va danh de ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. ((hieu van) or (lieu va)) cau luc va danh de ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((hieu van) or (lieu va)) cau luc va danh de ((cua triet) OR (va triet))*.