Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban hang » ngan hang
cau luc » cau truc, cau phuc
cuu tre » cua tre, cau tren, cau treo
va nang » van nang, da nang, cam nang
v nang » vu nang, van nang, voi nang
ve cuu » ve cau, ve chu, ve cua
va cau » van cau, va cac, va dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((v nang) OR (va nang)) xa hoi. lieu va cau luc ((ban hanh) or (ban hang)) ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((v nang) OR (va nang)) xa hoi. lieu va cau luc ((ban hanh) OR (ban hang)) ve cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((v nang) OR (va nang)) xa hoi. lieu va cau luc ((ban hanh) or (ban hang)) ve cuu tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((v nang) OR (va nang)) xa hoi. lieu va cau luc ((ban hanh) or (ban hang)) ve cuu tre*.