Perhaps you should try some spelling variations:
"modified caging optimization algorithmss" » "modified caging optimization algorithms", "modified caging estimation algorithms", "modified caging estimation algorithm", "modified staffing optimization algorithmss"
"modified objective optimisation algorithm" » "modified objective optimization algorithm", "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective estimation 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 caging optimization algorithmss") OR ("modified objective optimisation algorithm"))~.
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