Perhaps you should try some spelling variations:
"modified bayesian optimization algorithms" » "modified bayesian optimisation algorithm", "modified bayesian estimation algorithm", "modified bayesian optimized algorithms"
"modified changing estimation algorithms" » "modified changing estimation algorithm", "modified changing optimisation algorithm", "modified changing approximation algorithms", "modified channel estimation algorithms", "modified charging station algorithms", "modified caging estimation algorithms"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified changing estimation algorithms") OR ("modified bayesian optimization algorithms"))~.
• Removing quotes may allow a broader search: (( modified changing estimation algorithms ) or ( modified bayesian optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified changing estimation algorithms") or ("modified bayesian optimization algorithms"))*.