Perhaps you should try some spelling variations:
"wireless d2d fbg sensors" » "wireless 2 fbg sensors", "wireless ds fbg sensors", "wireless 12 fbg sensors"
"wireless dry eeg sensors" » "wireless days eeg sensors", "wireless ds eeg sensors", "wireless die eeg sensors", "wireless dry eyes sensors"
"wireless ad fbg sensors" » "wireless _ fbg sensors"

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: (((("wireless d2d fbg sensors") OR ("wireless ad fbg sensors"))) OR ("wireless dry eeg sensors")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"wireless d2d fbg sensors\") OR (\"wireless ad fbg sensors\"))) or (\"wireless dry eeg sensors\"))".
• Removing quotes may allow a broader search: (((( wireless d2d fbg sensors ) OR ( wireless ad fbg sensors ))) or ( wireless dry eeg sensors )).
• Adding a wildcard symbol may retrieve word variants: (((("wireless d2d fbg sensors") OR ("wireless ad fbg sensors"))) or ("wireless dry eeg sensors"))*.