Perhaps you should try some spelling variations:
involuntary hospitalisation » involuntary hospitalization
involuntary sterilization » involuntary hospitalization
voluntary hospitalization » involuntary hospitalization, compulsory hospitalization, voluntary organization

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: ((involuntary sterilization) OR (((voluntary hospitalization) OR (involuntary hospitalisation)))) / law AND legislation / slovak.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((involuntary sterilization) or (((voluntary hospitalization) OR (involuntary hospitalisation)))) / law and legislation / slovak".
• Adding a wildcard symbol may retrieve word variants: ((involuntary sterilization) or (((voluntary hospitalization) OR (involuntary hospitalisation)))) / law and legislation / slovak*.