Perhaps you should try some spelling variations:
"modified objective allocation algorithms" » "modified objective estimation algorithms", "modified objective approximation algorithms"
"modified parameter optimized algorithms" » "modified parameter optimized algorithm", "modified parameter optimizer algorithms", "modified parameter optimization algorithms"

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

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