Perhaps you should try some spelling variations:
"sphere optimization algorithms" » "sphere optimisation algorithm", "sphere estimation algorithms", "sphere estimation algorithm", "stage optimization algorithms", "response optimization algorithms"
"_ optimizer algorithms" » "_ optimized algorithms"
"_ optimized algorithm" » "_ optimized algorithms"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("_ optimizer algorithms") or ("_ optimized algorithm"))) or ("sphere optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("_ optimizer algorithms") OR ("_ optimized algorithm"))) OR ("sphere optimization algorithms")).
• Removing quotes may allow a broader search: (((( _ optimizer algorithms ) or ( _ optimized algorithm ))) or ( sphere optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("_ optimizer algorithms") or ("_ optimized algorithm"))) or ("sphere optimization algorithms"))*.