Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu ve » hieu va, hieu van
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
cac tuc » cac toc, cac tu, cac tac
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
di cuu » di cau, di cua, dinh cuu

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: ((te sach) OR (toc sach)) y ((nang x) OR (nang ma)) hoi. hieu ve cac tuc va danh di cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y ((nang x) or (nang ma)) hoi. hieu ve cac tuc va danh di cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y ((nang x) or (nang ma)) hoi. hieu ve cac tuc va danh di cuu tre*.