Perhaps you should try some spelling variations:
"gal robert b. german book" » "gal robert b. german books", "gal robert b. german food", "hall robert b. german book", "gal robert _. german book", "gal robert e. german book", "gal robert j. german book"
"a robert b. heimann book" » "3 robert b. heimann book", "dr robert b. heimann book", "a robot b. heimann book", "a robert _. heimann book", "a robert e. heimann book", "a robert j. heimann book"
"a robust b. heimann book" » "_ robust b. heimann book", "a robust _. heimann book", "a robust a. heimann book", "a robust job. heimann book"

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