Perhaps you should try some spelling variations:
"gail robert e. heilmann book" » "gal robert e. heilmann book", "hall robert e. heilmann book", "ball robert e. heilmann book", "gail robert _. heilmann book", "gail robert j. heilmann book", "gail robert e. heilemann book", "gail robert e. heimann book", "gail robert e. heitmann book", "gail robert e. heilmann books", "gail robert e. heilmann ebook"
"a robust _. hellman ebooks" » "_ robust _. hellman ebooks", "a robust _. hellman ebookss", "a robust _. hellman eebooks", "a robust _. helpman ebooks", "a robust _. heldman ebooks", "a robust _. hellman books", "a robust _. hellman ebook", "a robust _. hellman redbooks"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("gail robert e. heilmann book") OR ("a robust _. hellman ebooks"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"gail robert e. heilmann book\") OR (\"a robust _. hellman ebooks\"))*".
• Removing quotes may allow a broader search: (( gail robert e. heilmann book ) OR ( a robust _. hellman ebooks ))*.