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