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