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

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")).
• Removing quotes may allow a broader search: (( open resource software ) or ( human source software )).
• Adding a wildcard symbol may retrieve word variants: (("open resource software") or ("human source software"))*.