Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
predictor algorithm » predators algorithm, predation algorithm
a predictor » _ predictor, a prediction, _ prediction
modified a » modified _, modified df, modified adam
dfllocation » allocation, dislocation, dislocations

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified a predictor algorithm ) or ( modified dfllocation estimation algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified a predictor algorithm ) OR ( modified dfllocation estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (( modified a predictor algorithm ) or ( modified dfllocation estimation algorithms ))*.