Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm", "modified multiobjective approximation algorithms"
"modified channel optimization algorithms" » "modified channel optimisation algorithm", "modified channel estimation algorithm", "modified channel optimized algorithms", "modified channel estimation algorithms", "modified game optimization algorithms", "modified market optimization algorithms"

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 estimation algorithms") OR ("modified channel optimization algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified multiobjective estimation algorithms\") OR (\"modified channel optimization algorithms\"))".
• Removing quotes may allow a broader search: (( modified multiobjective estimation algorithms ) OR ( modified channel optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective estimation algorithms") OR ("modified channel optimization algorithms"))*.