Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
qua cam » qua cham, qua cac, qua ca
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
cam ke » cam khe, cam ky, ca ke
ke va » te 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 lang) OR (ky tang)) xa hoi. hieu qua cam ke va hanh vai ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky tang)) xa hoi. hieu qua cam ke va hanh vai ((cua triet) or (va triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky tang)) xa hoi. hieu qua cam ke va hanh vai ((cua triet) or (va triet))*.