Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va danh » va dinh, va dan, va hanh
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
tuc va » thuc va, truc va, tuc xa
co cua » con cua, cong cua, cuoi cua

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 ((le hoi) or (ma hoa)). hieu va cac tuc va danh ((ca cua) OR (co cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach v nang ((le hoi) OR (ma hoa)). hieu va cac tuc va danh ((ca cua) OR (co cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach v nang ((le hoi) or (ma hoa)). hieu va cac tuc va danh ((ca cua) OR (co cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach v nang ((le hoi) or (ma hoa)). hieu va cac tuc va danh ((ca cua) OR (co cua)) tre*.