Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective optimized algorithms"
"modified ohca estimation algorithm" » "modified orca estimation 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 ohca estimation algorithm") OR ("modified multiobjective optimization algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified ohca estimation algorithm\") OR (\"modified multiobjective optimization algorithms\"))*".
• Removing quotes may allow a broader search: (( modified ohca estimation algorithm ) OR ( modified multiobjective optimization algorithms ))*.