Perhaps you should try some spelling variations:
parameters estimation » parameter estimation, parameter estimates, parameter optimization
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
source algorithm » our algorithm, search algorithm
using source » using force, using morse
layer using » layer being, paper using, cancer using

You may be able to get more results by adjusting your search query.

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