Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van dau » phan dau
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
xac va » tac va, ac va, bac 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. thien ((van dau) OR (van dao)) xac va hanh dai ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. thien ((van dau) or (van dao)) xac va hanh dai ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. thien ((van dau) or (van dao)) xac va hanh dai ((cua triet) OR (va triet))*.