Any Yoga present in any horoscope never gets cancelled. If the yoga present is powerful, it will give good results, less powerful the results are also less. If the yoga has below 30% strength, it will not be very much felt by the native. There are beggars who sometimes have Raja Yoga and Dhurudhura yoga with feeble strengths. And even Kings have Kemadruma yoga. Read my blog navagrahastro.blogspot.in to get a better idea about evaluation of horoscopes.