Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dua tren » dung tren
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van dam
van cau » van dau, van hau, van 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 ((van cam) OR (van cau)) xuc va hanh di ((dua tren) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hoi. hieu ((van cam) OR (van cau)) xuc va hanh di ((dua tren) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu ((van cam) OR (van cau)) xuc va hanh di ((dua tren) or (cua triet))*.