Perhaps you should try some spelling variations:
sang lap » sang tao, sang ma, sang tai
su sach » so sach, vu sach
ky sang » ky nang, ky dang, ky tang
lap hai » lap tai, lap lai, lap hoat
hieu ve » hieu van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
loc va » hoc va
vi cua » vai cua, di cua
dau vi » dau ve, dau va, dat vi
luc va » duc va, tuc 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 hai. ((hieu ve) or (hieu va)) cam ((luc va) OR (loc va)) dau vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang lap hai. ((hieu ve) OR (hieu va)) cam ((luc va) OR (loc va)) dau vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang lap hai. ((hieu ve) or (hieu va)) cam ((luc va) OR (loc va)) dau vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang lap hai. ((hieu ve) or (hieu va)) cam ((luc va) OR (loc va)) dau vi cua te*.