Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
kho tang » cao tang
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
ky tang » ky nang, ky dang, ky trong
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
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: su sach ((ky tang) OR (kho tang)) mai hoi. hieu va cam xuc va hanh vi ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) or (kho tang)) mai hoi. hieu va cam xuc va hanh vi ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (kho tang)) mai hoi. hieu va cam xuc va hanh vi ((cua triet) OR (va triet))*.