Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"machines using rbf algorithm" » "machinery using rbf algorithm", "machines using _ algorithm", "machines using mom algorithm", "machines using our algorithm", "machines using ibm algorithm", "machines using raw algorithm"

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: (("machines using rbf algorithm") OR ("modified multiobjective optimization algorithm"))~.
• Removing quotes may allow a broader search: (( machines using rbf algorithm ) or ( modified multiobjective optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("machines using rbf algorithm") or ("modified multiobjective optimization algorithm"))*.