Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
thanh vi » thanh va, thanh ve, nhanh vi
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac lop » cac hop, cac loai
sach ky » sac ky, sach y, sach ty
lop va » lap va, hop va, nop va
ve cac » va cac, vien cac
thiet » thieu

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