Perhaps you should try some spelling variations:
"comparative assessment structures theory" » "formative assessment structures theory", "comprehensive assessment structures theory", "comparative assessment structure theory", "comparative assessment structural theory", "comparative assessing structure theory", "comparative assessment ruptures theory"
"filing requirements based history" » "filing requirement based history", "defining requirements based history", "holding requirements based history", "filing requirements basic history", "filing requirements case history", "filing requirements race history", "filing requirements bad 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 ("filing requirements based history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("comparative assessment structures theory") OR ("filing requirements based history")).
• Removing quotes may allow a broader search: (( comparative assessment structures theory ) or ( filing requirements based history )).
• Adding a wildcard symbol may retrieve word variants: (("comparative assessment structures theory") or ("filing requirements based history"))*.