Perhaps you should try some spelling variations:
limitation techniques » imputation techniques, mitigation techniques, augmentation techniques
simulation techniques » imputation techniques, mitigation techniques, segmentation techniques
based simulation » based simulated, a simulation, 3d simulation
no2 limitation » co limitation, food limitation
based based » based closed
based no2 » based co, based n

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 no2 limitation techniques ) or ( learning-based based simulation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based no2 limitation techniques ) OR ( learning-based based simulation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based no2 limitation techniques ) or ( learning-based based simulation techniques ))*.