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

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

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