Perhaps you should try some spelling variations:
"modified invasive optimisation algorithms" » "modified invasive optimization algorithms", "modified invasive estimation algorithms", "modified invasive estimation algorithm", "modified invasive optimization algorithmss", "modified invasive estimation algorithmss", "modified passive optimisation algorithms"
"modified allocation optimisation algorithm" » "modified allocation optimization algorithm", "modified allocation optimization algorithms", "modified allocation estimation algorithm", "modified allocation estimation algorithms"

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