Perhaps you should try some spelling variations:
precedent » precedents, preceding, preceded
precedence » preference, precedents
presidents » residents, presents, precedents
precedings » preceedings, preceding, procedings

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: ((precedent OR precedence) OR ((presidents OR president) OR precedings)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((precedent OR precedence) or ((presidents or president) or precedings))".
• Adding a wildcard symbol may retrieve word variants: ((precedent OR precedence) or ((presidents or president) or precedings))*.