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