Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms (Expand search)
algorithm derivation » algorithm creation (Expand search), algorithm validation (Expand search), algorithmic mediation (Expand search)
coder approximation » power approximation (Expand search), order approximation (Expand search), model approximation (Expand search)
derivation in » deprivation in (Expand search), derivation and (Expand search), derivations on (Expand search)
using coding » using coping (Expand search), using coating (Expand search), using cooking (Expand search)

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