Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc ban » thuoc tan, thuoc dang, thu ban
su triet » su viet, su tien, ve triet
ban hang » ngan hang
cao tang » cao dang
thi van » thi lan, thi hanh, thi nang
hang oi » hang doi, hang loi, hang di
su sach » so sach, vu sach
ky tang » ky nang, ky dang, ky trong
oi su » ki su, vi su

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