Perhaps you should try some spelling variations:
information documents » information documentation, information agents, information requirements
documents data » documents a
data decision » a decision
theory level » theory several, theory local, theory lewis
every level » energy level, entry level
theory law » theology law, theory local

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: information documents data decision ((((theory level) or (theory law))) or (every level))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information documents data decision ((((theory level) OR (theory law))) OR (every level)).
• Adding a wildcard symbol may retrieve word variants: information documents data decision ((((theory level) or (theory law))) or (every level))*.