Perhaps you should try some spelling variations:
"modified sphere estimation algorithms" » "modified sphere estimation algorithm", "modified sphere optimization algorithms", "modified sphere optimisation algorithm", "modified pose estimation algorithms"
"modified objective optimized algorithms" » "modified objective optimized algorithm", "modified objective optimizer algorithms", "modified objective optimization algorithms", "modified objective optimal algorithms"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified objective optimized algorithms\") OR (\"modified sphere estimation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified objective optimized algorithms ) OR ( modified sphere estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective optimized algorithms") OR ("modified sphere estimation algorithms"))*.