Perhaps you should try some spelling variations:
"open resources software." » "open source software.", "open resources southern.", "open resource software.", "open recorel software.", "coping resources software.", "power resources software."
"open sources software." » "open source software.", "open corel software.", "spain sources software.", "open spaces software."
"open sobre software." » "open source software.", "open por software.", "cohen sobre software.", "lopez sobre software."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("open sources software.") OR ("open sobre software."))) or ("open resources software."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("open sources software.") OR ("open sobre software."))) OR ("open resources software.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"open sources software.\") OR (\"open sobre software.\"))) or (\"open resources software.\"))".
• Removing quotes may allow a broader search: (((( open sources software. ) OR ( open sobre software. ))) or ( open resources software. )).
• Adding a wildcard symbol may retrieve word variants: (((("open sources software.") OR ("open sobre software."))) or ("open resources software."))*.