Perhaps you should try some spelling variations:
comparative assessment » formative assessment, comprehensive assessment
assessment structures » assessment structure, assessment structural, assessing structure
requirements based » requirements basic, requirements case, requirements race
structures theory » structure theory, structural theory, ruptures theory
based history » case history, bad history, basic history

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( comparative assessment structures theory ) or ( borrowing requirements based history ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( comparative assessment structures theory ) OR ( borrowing requirements based history )).
• Adding a wildcard symbol may retrieve word variants: (( comparative assessment structures theory ) or ( borrowing requirements based history ))*.