Perhaps you should try some spelling variations:
"soviet period relations humaines en." » "soviet period relations humanists en.", "soviet period relation humain en.", "soviet personal relations humaines en.", "soviet period section humaines en.", "soviet period relations humaines et.", "soviet period relations humaines un.", "soviet period relations humaines les."
"soviet regime relations ukraine krieg." » "soviet regime regulation ukraine krieg.", "soviet regime region ukraine krieg.", "soviet regime relations eine krieg.", "soviet region relations ukraine krieg.", "soviet regime predictions ukraine krieg.", "soviet regional relations ukraine krieg.", "soviet regime relations ukraine kiev.", "soviet regime relations kleine krieg.", "soviet regime relations ukraine kyiv."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("soviet period relations humaines en.") or ("soviet regime relations ukraine krieg."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("soviet period relations humaines en.") OR ("soviet regime relations ukraine krieg.")).
• Removing quotes may allow a broader search: (( soviet period relations humaines en. ) or ( soviet regime relations ukraine krieg. )).
• Adding a wildcard symbol may retrieve word variants: (("soviet period relations humaines en.") or ("soviet regime relations ukraine krieg."))*.