Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban thanh » ban hanh
ban hang » ngan hang
van nang » van quang, van ban, van dong
cuu tre » cua tre, cau tren, cau treo
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
v nang » va nang, vu nang, voi nang
ve cuu » ve cau, ve chu, ve cua
va cam » va cham, va cac, va cao

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