Perhaps you should try some spelling variations:
sang lap » sang tao, sang ma, sang tai
lap hoat » tap hoa, dan hoat, lap dat
so sach » so sanh, bo sach, co sach
cam luc » cam xuc, cau luc
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
ky sang » ky nang, ky dang, ky tang
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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

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