Perhaps you should try some spelling variations:
"modified multiobjective approximation algorithms" » "modified multiobjective optimization algorithms"
"model forecasting mixed algorithm" » "model forecasting method algorithm", "model forecasting air algorithm", "model forecasting driven algorithm", "model forecasting winner algorithm"

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 approximation algorithms") or ("model forecasting mixed algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective approximation algorithms") OR ("model forecasting mixed algorithm")).
• Removing quotes may allow a broader search: (( modified multiobjective approximation algorithms ) or ( model forecasting mixed algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective approximation algorithms") or ("model forecasting mixed algorithm"))*.