Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
approximation algorithm » approximation algorithms
adaptive optimization » objective optimization, adaptive quantization, static optimization
modified adaptive » modified passive
bi1 approximation » time approximation, _ approximation, one approximation
modified bi1 » modified _

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified adaptive optimization algorithms ) OR ( modified bi1 approximation algorithm ))~".
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