Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
objective estimation » objective optimization, objective allocation
research algorithm » search algorithm
rising research » writing research, nursing research, original research
code rising » code using

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

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