Perhaps you should try some spelling variations:
"a robert j. heimann books" » "a robert j. demand books", "a robert j. german books", "3 robert j. heimann books", "dr robert j. heimann books", "a robot j. heimann books", "a robert e. heimann books"
"a robert _. hermann book" » "a robert _. hermann broch", "a robert _. hermann lohr", "a robert _. hermann von", "3 robert _. hermann book", "dr robert _. hermann book", "a robot _. hermann book"
"a robust a. german book" » "a robust a. german books", "a robust a. german food", "_ robust a. german book", "a robust _. german book", "a robust cat. german book", "a robust lca. german book"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("a robert j. heimann books") or ("a robert _. hermann book"))) or ("a robust a. german book"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robert j. heimann books") OR ("a robert _. hermann book"))) OR ("a robust a. german book")).
• Removing quotes may allow a broader search: (((( a robert j. heimann books ) or ( a robert _. hermann book ))) or ( a robust a. german book )).
• Adding a wildcard symbol may retrieve word variants: (((("a robert j. heimann books") or ("a robert _. hermann book"))) or ("a robust a. german book"))*.