Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
mang xa » lang xa, mang may, dang xay
so sach » bo sach, co sach, hoc sach
ty mang » ty xang, ty hang, tin mang
so sanh » do sanh
va chay » va chat, va cham, va cay
tui va » tuoi va, tri va, thi va
tai va » thai va, mai va, tri va
dao ve » bao ve, dap ve, dau ve
ve su » va 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: ((so sach) OR (so sanh)) ty mang xa hoi. lieu va chay ((tui va) OR (tai va)) dao ve su triet~.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) ty mang xa hoi. lieu va chay ((tui va) or (tai va)) dao ve su triet*.