Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cua triet » cua viet, su triet, va triet
bach xuc » bach tuoc, bach xuan, bach hue
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
cua tre » cua te, cuu tre, dua tren
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc 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)) ma hoi. hieu vien bach xuc va hanh vai ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) or (ky nang)) ma hoi. hieu vien bach xuc va hanh vai ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) or (ky nang)) ma hoi. hieu vien bach xuc va hanh vai ((cua tre) OR (cua triet))*.