Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van doanh » toan doanh, van dong, van thanh
cau treo » cau theo, cau tren, cau triet
ky sang » ky dang, ky tang, duy sang
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
tai cau » tai cac, tai cao
ma hoi » mai hoi, xa hoi, ma hoa

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 ((ky sang) or (ky nang)) ma hoi. hieu va ((cac du) or (cao duc)) van doanh tai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky sang) OR (ky nang)) ma hoi. hieu va ((cac du) OR (cao duc)) van doanh tai cau treo.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ky sang) or (ky nang)) ma hoi. hieu va ((cac du) or (cao duc)) van doanh tai cau treo*.