Perhaps you should try some spelling variations:
robust j » robert j
a robert » gal robert, a robust
robert e » robert _, robert j
heilmann » heitmann, heinemann, hermann
book » books, ebook
ebooksss » ebookssss, eebooksss, ebooks
ebookss » ebooksss, eebookss
heimann » hermann, heinemann

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( a ((robust j) OR (robust _)). heilmann book ) or ( a robert e. heimann (ebooksss or ebookss) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( a ((robust j) OR (robust _)). heilmann book ) OR ( a robert e. heimann (ebooksss OR ebookss) ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( a ((robust j) OR (robust _)). heilmann book ) or ( a robert e. heimann (ebooksss or ebookss) ))*".