Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"core using source algorithm" » "core using our algorithm", "core using search algorithm", "core using force algorithm", "core using morse algorithm", "code using source algorithm", "care nursing source algorithm"

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

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