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