Perhaps you should try some spelling variations:
"maternal recognition" » "pattern recognition", "numeral recognition", "mate recognition"
"emotions recognition" » "emotion recognition", "motion recognition", "emotion cognition"
"mutual recognition" » "visual recognition", "facial recognition"

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: (((("maternal recognition") OR ("mutual recognition"))) OR ("emotions recognition")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"maternal recognition\") OR (\"mutual recognition\"))) or (\"emotions recognition\"))".
• Removing quotes may allow a broader search: (((( maternal recognition ) OR ( mutual recognition ))) or ( emotions recognition )).
• Adding a wildcard symbol may retrieve word variants: (((("maternal recognition") OR ("mutual recognition"))) or ("emotions recognition"))*.