Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van nang » van quang, van ban, van dong
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
cam luc » cam xuc, cau luc
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va
luc va » duc va, tuc va, loc va
v nang » va nang, vu nang, voi nang
di cuu » di cau, di cua, dinh cuu

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) or (hieu qua)) cam luc va danh di 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) OR (hieu qua)) cam luc va danh di 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) or (hieu qua)) cam luc va danh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((v nang) OR (van nang)) xa hoi. ((hieu va) or (hieu qua)) cam luc va danh di cuu tre*.