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