Perhaps you should try some spelling variations:
"modified multiobjective approximation algorithms" » "modified multiobjective optimization algorithms"
"modified dpose estimation algorithm" » "modified pose estimation algorithm", "modified pulses estimation algorithm", "modified sphere estimation algorithm"

You may be able to get more results by adjusting your search query.

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