Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
doanh va » doan va, doanh tai, doanh cua
va doanh » van doanh, vay doanh, va danh
hieu van » hieu va, thien van, lieu va
hoc sach » hoc sinh, hoc cac, hoc anh
tang van » dang van, hoang van, trong van
van hoi » van hoa, van hoc, van hoe
nam xuc » cam xuc, nam xua, nam thuc
su tien » su kien, su hien, tu tieng
cuu tre » cua tre, cau tren, cau treo
y tang » ky tang, 6 tang, 7 tang
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) y tang van hoi. hieu van nam xuc va doanh va ((su tien) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y tang van hoi. hieu van nam xuc va doanh va ((su tien) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) y tang van hoi. hieu van nam xuc va doanh va ((su tien) or (cuu tre))*".