Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
ve cham » va cham, ve chat, vu cham
vi cua » vai cua, di cua
cua te » cua tu
luc va » duc va, tuc va, loc va
ve cam » ve cac, va cam, ve cai

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