Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
cua triet » cua viet, su triet, va triet
ban hang » ngan hang
hang vi » hang va, hanh vi, hang di
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
vu nang » vuc nang, va nang, vu dang
v nang » va nang, van nang, voi nang
vi cua » vai cua, di cua

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: su sach ((v nang) OR (vu nang)) xa hoi. hieu va ((nam thuoc) OR (cau truc)) ban hang vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) OR (vu nang)) xa hoi. hieu va ((nam thuoc) or (cau truc)) ban hang vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) OR (vu nang)) xa hoi. hieu va ((nam thuoc) or (cau truc)) ban hang vi cua triet*.