Perhaps you should try some spelling variations:
information agents » information age, information access, information about
methods practical » methods practice
methods critical » methods chemical, methods physical
ag3 regression » angle regression, dagum regression, data regression
3 regression » _ regression, 7 regression, ii regression

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

• Performing a fuzzy search may retrieve terms with similar spellings: information agents ((ag3 regression) or (3 regression)) ((methods critical) or (methods practical))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information agents ((ag3 regression) OR (3 regression)) ((methods critical) OR (methods practical)).
• Adding a wildcard symbol may retrieve word variants: information agents ((ag3 regression) or (3 regression)) ((methods critical) or (methods practical))*.