Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vien cac » vien bach, vien dai, vien da
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
co sach » bo sach, cuon sach, hoc sach
ve cac » va cac
ma hoi » mai hoi, xa hoi, ma hoa
toc va » hoc va, toc ta, tuc 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 (co sach)) y nang ma hoi. hieu ((ve cac) OR (vien cac)) toc va hanh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) y nang ma hoi. hieu ((ve cac) OR (vien cac)) toc va hanh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) y nang ma hoi. hieu ((ve cac) OR (vien cac)) toc va hanh vai cua triet*.