Perhaps you should try some spelling variations:
"human resources software" » "human source software", "human outsourced software", "human measures software"
"open resource software" » "open source software", "open opensource software", "open resonance software", "open resources software", "ocean resource software"
"human resource software" » "human source software", "human opensource software", "human resonance 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 resource software") OR ("human resources software")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"open resource software\") or (((\"human resource software\") OR (\"human resources software\"))))".
• Removing quotes may allow a broader search: (( open resource software ) or ((( human resource software ) OR ( human resources software )))).
• Adding a wildcard symbol may retrieve word variants: (("open resource software") or ((("human resource software") OR ("human resources software"))))*.