Perhaps you should try some spelling variations:
"modified multiobjective approximation algorithms" » "modified multiobjective optimization algorithms"
"modified total variation algorithms" » "modified total estimation algorithms", "modified total vision algorithms", "modified total estimation algorithm", "modified global variation algorithms", "modified thermal variation algorithms", "modified ti6al4v variation 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 total variation algorithms") OR ("modified multiobjective approximation algorithms"))~.
• Removing quotes may allow a broader search: (( modified total variation algorithms ) or ( modified multiobjective approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified total variation algorithms") or ("modified multiobjective approximation algorithms"))*.