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