Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
ky sang » ky dang, ky tang, duy sang
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
hue va » thue va, nhue va, he 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 ((ky sang) OR (ky nang)) xa hoi. hieu vien (bach OR cach) hue va hanh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) or (ky nang)) xa hoi. hieu vien (bach OR cach) hue va hanh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) or (ky nang)) xa hoi. hieu vien (bach OR cach) hue va hanh vai cua triet*.