Perhaps you should try some spelling variations:
sang lap » sang tao, sang ma, sang tai
lap hoat » tap hoa, dan hoat, lap dat
su sach » so sach, vu sach
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu van
danh vi » hanh vi, dinh vi, danh di
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
luc va » duc va, tuc va
vi cua » vai cua, di cua
loc va » hoc va
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky sang lap hoat. ((hieu ve) or (hieu va)) cam ((loc va) OR (luc va)) danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang lap hoat. ((hieu ve) OR (hieu va)) cam ((loc va) OR (luc va)) danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang lap hoat. ((hieu ve) or (hieu va)) cam ((loc va) OR (luc va)) danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang lap hoat. ((hieu ve) or (hieu va)) cam ((loc va) OR (luc va)) danh vi cua te*.