Perhaps you should try some spelling variations:
"modified allocation optimisation algorithm" » "modified allocation optimization algorithm", "modified allocation estimation algorithm", "modified allocation estimation algorithms"
"modified invasive optimization algorithms" » "modified invasive estimation algorithms", "modified invasive estimation algorithm", "modified invasive optimized algorithms", "modified passive optimization 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 allocation optimisation algorithm") or ("modified invasive optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified allocation optimisation algorithm") OR ("modified invasive optimization algorithms")).
• Removing quotes may allow a broader search: (( modified allocation optimisation algorithm ) or ( modified invasive optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified allocation optimisation algorithm") or ("modified invasive optimization algorithms"))*.