Perhaps you should try some spelling variations:
"allocation optimization algorithms" » "allocation optimisation algorithm", "allocation estimation algorithms", "allocation estimation algorithm", "location optimization algorithms"
"parameters estimation algorithmssssssssss" » "parameter estimation algorithmssssssssss", "parameter estimates algorithmssssssssss", "parameter optimization algorithmssssssssss"

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: (("allocation optimization algorithms") OR ("parameters estimation algorithmssssssssss"))~.
• Removing quotes may allow a broader search: (( allocation optimization algorithms ) or ( parameters estimation algorithmssssssssss ))~.
• Adding a wildcard symbol may retrieve word variants: (("allocation optimization algorithms") or ("parameters estimation algorithmssssssssss"))*.