Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"modified total variation algorithm" » "modified total estimation algorithm", "modified total predation algorithm", "modified total estimation algorithms", "modified global variation algorithm", "modified thermal variation algorithm", "modified ti6al4v variation 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 multiobjective optimization algorithm") or ("modified total variation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective optimization algorithm") OR ("modified total variation algorithm")).
• Removing quotes may allow a broader search: (( modified multiobjective optimization algorithm ) or ( modified total variation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective optimization algorithm") or ("modified total variation algorithm"))*.