Perhaps you should try some spelling variations:
resource software » resources software, opensource software, resonance software
open resource » open resources, ocean resource, open source
human source » human sources, human resource, humans sources

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: (( open resource software ) OR ( human source software )).
• Adding a wildcard symbol may retrieve word variants: (( open resource software ) or ( human source software ))*.