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