Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
jose optimization » game optimization, robust optimization, stage optimization
one approximation » time approximation, _ approximation, rough approximations
qoe optimization » game optimization, _ optimization, stage optimization

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

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