Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
kho tang » cao tang
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, ky trong
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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) OR (va danh)) vi cua 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) OR (va danh)) vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (kho tang)) mai hoi. hieu va cam xuc ((va hanh) OR (va danh)) vi cua triet*.