Perhaps you should try some spelling variations:
sang lap » sang tao, sang ma, sang tai
su sach » so sach, vu sach
cam luc » cam xuc, cau luc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » hieu van
lap hai » lap tai, lap lai, lap hoat
ky sang » ky nang, ky dang, ky tang
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
cua tu » cua tuc, cua su, cua cu

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 dan vi ((cua te) OR (cua tu))~.
• 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 dan vi ((cua te) OR (cua tu)).
• 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 dan vi ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang lap hai. ((hieu ve) or (hieu va)) cam luc va dan vi ((cua te) OR (cua tu))*.