Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
vanh tai » van tai, hanh tai, anh tai
va vanh » va van, va danh, va hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va cham » va tham
va chat » van chat, va phat, cao chat
xuc va » duc va, tuc va, luc va
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 ky nang o hoi. hieu ((va cham) OR (va chat)) xuc va vanh tai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hoi. hieu ((va cham) OR (va chat)) xuc va vanh tai ((cua triet) or (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu ((va cham) OR (va chat)) xuc va vanh tai ((cua triet) or (cua viet))*.