Perhaps you should try some spelling variations:
"modified objective convolution algorithms" » "modified objective evolution algorithm", "modified objective solution algorithm"
"modified changing estimation algorithm" » "modified channel estimation algorithm", "modified charging station algorithm", "modified caging 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 changing estimation algorithm") OR ("modified objective convolution algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified changing estimation algorithm\") OR (\"modified objective convolution algorithms\"))".
• Removing quotes may allow a broader search: (( modified changing estimation algorithm ) OR ( modified objective convolution algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified changing estimation algorithm") OR ("modified objective convolution algorithms"))*.