Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
ban hang » ngan hang
su triet » su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
thi van » thi lan, thi hanh, thi nang
hang oi » hang doi, hang loi, hang di
su viet » so viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. thi van ((nam thuc) or (nam thuoc)) ban hang oi ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. thi van ((nam thuc) OR (nam thuoc)) ban hang oi ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. thi van ((nam thuc) or (nam thuoc)) ban hang oi ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. thi van ((nam thuc) or (nam thuoc)) ban hang oi ((su triet) OR (su viet))*.