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
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
cam loc » cam lo
hieu va » lieu va, hieu qua
hieu ve » hieu van
ky sang » ky nang, ky dang, ky tang
loc va » hoc va, luc va
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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 danh ((vi cua) OR (di 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 danh ((vi cua) OR (di 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 danh ((vi cua) OR (di cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang lap hoat. ((hieu ve) or (hieu va)) cam loc va danh ((vi cua) OR (di cua)) te*.