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 resource software" » "human resources software", "human opensource software", "human resonance software"
"human source software" » "human sources software", "humans sources software", "bhutan source software"

Try widening your search to All Fields.

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 source software")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"open resource software\") or (((\"human resource software\") OR (\"human source software\"))))".
• Removing quotes may allow a broader search: (( open resource software ) or ((( human resource software ) OR ( human source software )))).
• Adding a wildcard symbol may retrieve word variants: (("open resource software") or ((("human resource software") OR ("human source software"))))*.