Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thanh vi » thanh va, thanh ve, nhanh vi
cac lop » cac hop, cac loai
sach ky » sac ky, sach y, sach kem
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
lop va » lap va, hop va, nop va
ve cac » va cac, vien cac

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) OR (sach ty)) lang xa hoi. hieu ve cac lop va ((thanh vi) OR (hanh vi)) va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach ty)) lang xa hoi. hieu ve cac lop va ((thanh vi) or (hanh vi)) va triet~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach ty)) lang xa hoi. hieu ve cac lop va ((thanh vi) or (hanh vi)) va triet*.