Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified male estimation algorithms" » "modified male estimation algorithm", "modified male optimization algorithms", "modified male optimisation algorithm", "modified pose estimation algorithms", "modified pulses estimation 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 coverage approximation algorithms") OR ("modified male estimation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified coverage approximation algorithms\") OR (\"modified male estimation algorithms\"))".
• Removing quotes may allow a broader search: (( modified coverage approximation algorithms ) OR ( modified male estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified coverage approximation algorithms") OR ("modified male estimation algorithms"))*.