Perhaps you should try some spelling variations:
"a robert e. hermann book" » "gal robert e. hermann book", "a robert _. hermann book", "a robert e. hermann books", "a robert e. hermann ebook"
"a robert j. hermann book" » "gal robert j. hermann book", "a robert _. hermann book", "a robert j. hermann books", "a robert j. hermann ebook"
"a robust j. heimann book" » "_ robust j. heimann book", "a robust _. heimann book", "a robust j. heimann books", "a robust j. heimann ebook", "a robust j. heinemann book"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a robert e. hermann book") OR ("a robert j. hermann book"))) OR ("a robust j. heimann book"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a robert e. hermann book\") OR (\"a robert j. hermann book\"))) or (\"a robust j. heimann book\"))~".
• Removing quotes may allow a broader search: (((( a robert e. hermann book ) OR ( a robert j. hermann book ))) or ( a robust j. heimann book ))~.
• Adding a wildcard symbol may retrieve word variants: (((("a robert e. hermann book") OR ("a robert j. hermann book"))) or ("a robust j. heimann book"))*.