Perhaps you should try some spelling variations:
conformation changes » conformational changes, information changes, conformational change
space extension » spaces extension, spaces extensions, span extension
changes space » changer space, channels space, changes since
array string » array strong, arrays strings, array sharing
array using » arrays using

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

• Performing a fuzzy search may retrieve terms with similar spellings: conformation changes space extension ((((array string) or (array using))) or (array format))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: conformation changes space extension ((((array string) OR (array using))) OR (array format)).
• Adding a wildcard symbol may retrieve word variants: conformation changes space extension ((((array string) or (array using))) or (array format))*.