Perhaps you should try some spelling variations:
thuc ban » thuoc ban, thu ban, thuc van
thuc dan » thuc hanh, hoc dan, thuc vat
hang hoi » hang hoa, hang hai, hang doi
va triet » va thiet, va trien, ve triet
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu le » hieu ve, hieu he, tieu le
hieu ly » hieu ky, lieu ly, dieu ly

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: so sach ky nang xa hoi. ((hieu le) OR (hieu ly)) nam ((thuc ban) OR (thuc dan)) hang hoi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. ((hieu le) OR (hieu ly)) nam ((thuc ban) or (thuc dan)) hang hoi va triet~".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. ((hieu le) OR (hieu ly)) nam ((thuc ban) or (thuc dan)) hang hoi va triet*.