Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau theo » cau thi, cau tao
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao
ve tai » te tai, de tai, le tai
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu ((ve tai) OR (va cao)) duc va hanh vi ((cua triet) OR (cau theo))~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoi. hieu ((ve tai) or (va cao)) duc va hanh vi ((cua triet) or (cau theo))*.