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 lohr" » "a robert _. hermann der", "a robert _. hermann von", "3 robert _. hermann lohr", "dr robert _. hermann lohr", "a robot _. hermann lohr"
"a robust e. heilman book" » "a robust e. german book", "_ robust e. heilman book", "a robust _. heilman book", "a robust a. heilman book", "a robust end. heilman 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 lohr"))) or ("a robust e. heilman book"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robert j. heimann books") OR ("a robert _. hermann lohr"))) OR ("a robust e. heilman book")).
• Removing quotes may allow a broader search: (((( a robert j. heimann books ) or ( a robert _. hermann lohr ))) or ( a robust e. heilman book )).
• Adding a wildcard symbol may retrieve word variants: (((("a robert j. heimann books") or ("a robert _. hermann lohr"))) or ("a robust e. heilman book"))*.