Perhaps you should try some spelling variations:
"modified pulses optimisation algorithms" » "modified pulses optimisation algorithm", "modified pulses optimization algorithms", "modified pulses estimation algorithms"
"modified allocation optimization algorithm" » "modified allocation optimization algorithms", "modified allocation optimisation algorithm", "modified allocation estimation algorithm", "modified location optimization algorithm"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified pulses optimisation algorithms") or ("modified allocation optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified pulses optimisation algorithms") OR ("modified allocation optimization algorithm")).
• Removing quotes may allow a broader search: (( modified pulses optimisation algorithms ) or ( modified allocation optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified pulses optimisation algorithms") or ("modified allocation optimization algorithm"))*.