Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
toc sach » hoc sach, doc sach, thuoc sach
va doanh » van doanh, vay doanh, va danh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cam duc » cao duc, pham duc, nam duoc
ma hoi » mai hoi, xa hoi, me hoi
ca te » cua te, ca ve, ca me

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 ky nang ((ma hoi) OR (ma hoa)). hieu ve ((cam duc) OR (cam xuc)) va doanh dan ca te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((ma hoi) or (ma hoa)). hieu ve ((cam duc) OR (cam xuc)) va doanh dan ca te~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((ma hoi) or (ma hoa)). hieu ve ((cam duc) OR (cam xuc)) va doanh dan ca te*.