Perhaps you should try some spelling variations:
"elgar origin references" » "elgar brain references", "solar origin references", "ear origins references", "error origin references"
"algal origin references" » "algal brain references", "legal origin references", "glial origin references", "animal origin references"
elgar signals » pulsar signals, radar signals, sonar signals
clear signals » clear goals, radar signals, sonar signals

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: (("((elgar signals) or (clear signals)) references") OR ((("elgar origin references") OR ("algal origin references")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"((elgar signals) or (clear signals)) references\") or (((\"elgar origin references\") OR (\"algal origin references\"))))".
• Removing quotes may allow a broader search: (( ((elgar signals) or (clear signals)) references ) or ((( elgar origin references ) OR ( algal origin references )))).
• Adding a wildcard symbol may retrieve word variants: (("((elgar signals) or (clear signals)) references") or ((("elgar origin references") OR ("algal origin references"))))*.