Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
nang mai » nang ma, nang tai, lang mai
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac toi » cac thoi
su sach » so sach, vu sach
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
bo sach » co sach, hoc sach
toi va » thoi va, tuoi va, hoi va
y nang » ky nang, ly nang, v nang

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) OR (bo sach)) y nang mai hoi. ((hieu ve) OR (hieu va)) cac toi va hanh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (bo sach)) y nang mai hoi. ((hieu ve) OR (hieu va)) cac toi va hanh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (bo sach)) y nang mai hoi. ((hieu ve) OR (hieu va)) cac toi va hanh vai cua triet*.