Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
cac toc » cac toi, cac nuoc, cac thoi
su sach » vu sach
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
toc va » hoc va, toc ta, tuc va
vai su » va su, van su, lai su

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