Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
staffing optimisation » staffing optimization, static optimization
time approximation » one approximation, _ approximation
modified staffing » modified caging
modified time » modified bi1, modified male

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

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