Perhaps you should try some spelling variations:
imputation techniques » implantation technique, augmentation techniques, segmentation techniques
simulation technique » inhalation technique, implantation technique, mitigation techniques
closed simulation » based simulation
based closed » based code, based cross
based tool » based two

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( learning-based closed simulation technique ) or ( learning-based tool imputation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based closed simulation technique ) OR ( learning-based tool imputation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based closed simulation technique ) or ( learning-based tool imputation techniques ))*.