Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
dose approximation » one approximation, _ approximation, rough approximations
time approximation » one approximation, _ approximation
game optimization » stage optimization, qoe optimization, market optimization

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((dose approximation) OR (time approximation)) algorithms ) or ( game optimization algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((dose approximation) OR (time approximation)) algorithms ) OR ( game optimization algorithm ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((dose approximation) OR (time approximation)) algorithms ) or ( game optimization algorithm ))*".