Perhaps you should try some spelling variations:
"modified pulses optimisation algorithm" » "modified pulses optimization algorithms", "modified pulses estimation algorithm", "modified pulses estimation algorithms"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified pulses optimisation algorithm") or ("modified notion approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified pulses optimisation algorithm") OR ("modified notion approximation algorithms"))*.
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