Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
ky sang » ky nang, ky tang, duy sang
vai cua » dai cua, hai cua, lai cua
ky dang » ky nang, ky danh
lap hai » lap tai, lap lai, lap hoat
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
va dinh » van dinh, va kinh, va tinh
vi cua » di cua
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va

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