Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
va triet » va trien, ve triet, cua triet
hanh vai » hanh vi, hanh va, hanh tai
thuoc va » thuc va, thuoc ma, thuong va
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
ve nam » he nam, va nam, le nam
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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 ((ly nang) OR (ly hang)) x hoi. hieu ve nam thuoc va hanh vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ly hang)) x hoi. hieu ve nam thuoc va hanh vai ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) OR (ly hang)) x hoi. hieu ve nam thuoc va hanh vai ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) OR (ly hang)) x hoi. hieu ve nam thuoc va hanh vai ((va triet) or (va thiet))*.