Perhaps you should try some spelling variations:
22differential equations » 5.5differential equations, differential equation, diferential equations
ofdifferential equations » 5.5differential equations, differential equation, diferential equations
b.differential equations » 5.5differential equations, differential equation, diferential equations
_ differentialequations » 5.5differential equations, differential equation, diferential equations
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) OR (_ differentialequations))))))%2c partial%22.
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• Adding a wildcard symbol may retrieve word variants: %((22differential equations) or (((ofdifferential equations) or (((b.differential equations) OR (_ differentialequations))))))%2c partial%22*.