Perhaps you should try some spelling variations:
"modified based investigation algorithm" » "modified based estimation algorithm", "modified based estimation algorithms", "modified raising investigation algorithm", "modified effect investigation algorithm", "modified male investigation algorithm"
"modified objective allocation algorithm" » "modified objective estimation algorithm", "modified objective evolution algorithm", "modified objective predation algorithm"

Try widening your search to All Fields.

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

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