Perhaps you should try some spelling variations:
imputation techniques » implantation technique, augmentation techniques, segmentation techniques
simulation techniques » mitigation techniques, segmentation techniques, inhalation technique
n simulation » _ simulation, a simulation, _ simulations
based nnode » based anode, based anodes, based code
based n » based _, based k, based no2

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 nnode imputation techniques ) or ( learning-based n simulation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based nnode imputation techniques ) OR ( learning-based n simulation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based nnode imputation techniques ) or ( learning-based n simulation techniques ))*.