Perhaps you should try some spelling variations:
"modified quantile optimisation algorithm" » "modified quantile optimization algorithms", "modified quantile estimation algorithm", "modified quantile estimation algorithms", "modified adaptive optimisation algorithm"
"modified passive approximation algorithms" » "modified time approximation algorithms", "modified adaptive approximation 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 passive approximation algorithms") OR ("modified quantile optimisation algorithm"))~.
• Removing quotes may allow a broader search: (( modified passive approximation algorithms ) or ( modified quantile optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified passive approximation algorithms") or ("modified quantile optimisation algorithm"))*.