Perhaps you should try some spelling variations:
"radar signals references" » "radar goals references", "radar minerals references", "radar pitfalls references", "radar signal references", "radio signals references"
"elgar origins references" » "elgar origin references", "elgar horizons references", "elgar resins references", "ear origins references", "stellar origins references", "celluar origins references"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("radar signals references") OR ("elgar brain references"))) OR ("elgar origins references")).
• Removing quotes may allow a broader search: (((( radar signals references ) or ( elgar brain references ))) or ( elgar origins references )).
• Adding a wildcard symbol may retrieve word variants: (((("radar signals references") or ("elgar brain references"))) or ("elgar origins references"))*.