Perhaps you should try some spelling variations:
5.5differential equations » ofdifferential equations, differential equation, _ differentialequations
22differential equations » ofdifferential equations, differential equation, _ differentialequations
b.differential equations » ofdifferential equations, differential equation, _ differentialequations
2c partial » c partial, 22 partial, 23 partial

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• If you are trying to use Boolean operators, they must be ALL CAPS: %((22differential equations) OR (((b.differential equations) OR (5.5differential equations))))%2c partial%22.
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