Perhaps you should try some spelling variations:
su sach » so sach, vu sach
cam luc » cam xuc, cau luc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
ky sang » ky nang, ky dang, ky tang
xa hai » xa thai, xua hai, xa hoi
ma hai » ta hai, va hai, manh hai
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
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 ((ma hai) OR (xa hai)). ((hieu va) or (hieu qua)) cam luc va dan vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ((ma hai) OR (xa hai)). ((hieu va) OR (hieu qua)) cam luc va dan vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ((ma hai) OR (xa hai)). ((hieu va) or (hieu qua)) cam luc va dan vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ((ma hai) OR (xa hai)). ((hieu va) or (hieu qua)) cam luc va dan vi cua te*.