Perhaps you should try some spelling variations:
ionization fragmentation » excitation fragmentation, formation fragmentation, coordination fragmentation
fragmentation methods » segmentation methods, argumentation methods, segmentation method
methods fusion » methods vision, methods diffusion, methods function
basics linear » basic linear, based linear, basics clear
class linear » mass linear, class library, class life

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

• Performing a fuzzy search may retrieve terms with similar spellings: ionization fragmentation methods fusion ((((basics linear) or (class linear))) or (less linear))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ionization fragmentation methods fusion ((((basics linear) OR (class linear))) OR (less linear)).
• Adding a wildcard symbol may retrieve word variants: ionization fragmentation methods fusion ((((basics linear) or (class linear))) or (less linear))*.