Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
vu nang » vuc nang, va nang, vu dang
van cau » van dau, van hau, van chat
va danh » va dinh, va dan, va hanh
cau xuc » cam xuc, cau luc, cau truc
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
vi cau » va cau, ve cau, viet cau
di cau » da cau, diem cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y nang) OR (vu nang)) ma hoa. hieu van cau xuc va danh ((vi cau) OR (di cau)) treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y nang) or (vu nang)) ma hoa. hieu van cau xuc va danh ((vi cau) OR (di cau)) treo~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) or (vu nang)) ma hoa. hieu van cau xuc va danh ((vi cau) OR (di cau)) treo*.