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