Perhaps you should try some spelling variations:
estimates algorithms » estimation algorithms, estimation algorithm, optimized algorithms
parameter estimates » parameter estimation
controlled source » controlled study
source algorithm » our algorithm, search algorithm
code controlled » time controlled

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

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