Perhaps you should try some spelling variations:
"wireless dry fbg sensors" » "wireless days fbg sensors", "wireless ds fbg sensors", "wireless die fbg sensors"
"wireless d2d eeg sensors" » "wireless ad eeg sensors", "wireless 2 eeg sensors", "wireless ds eeg sensors"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("wireless dry fbg sensors") OR ("wireless d2d eeg sensors")).
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