Perhaps you should try some spelling variations:
storage representation » knowledge representation
representation 2 » representation _, representation a, representation based
qsar based » quasar based, ar based, car based
snar based » snag based, star based, sugar based
sar based » star based, ar based, car based
2 curtan » _ curtain, _ cartan, _ curtin

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((sar based) or (qsar based))) or (snar based)) storage representation 2 curtan-metragem~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((sar based) OR (qsar based))) OR (snar based)) storage representation 2 curtan-metragem.
• Adding a wildcard symbol may retrieve word variants: ((((sar based) or (qsar based))) or (snar based)) storage representation 2 curtan-metragem*.