Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
va tinh » may tinh
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
lap hai » lap tai, lap lai, lap hoat
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
va dinh » van dinh, va kinh, vu dinh
vi cua » vai cua, di cua
ve cau » ke cau, va cau, ve cac
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: so sach ((ky sang) or (ky dang)) lap hai. hieu ve cau luc ((va dinh) or (va tinh)) vi 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 cau luc ((va dinh) OR (va tinh)) vi cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ((ky sang) or (ky dang)) lap hai. hieu ve cau luc ((va dinh) or (va tinh)) vi cua te*.