Perhaps you should try some spelling variations:
a robust » _ robust
robust j » robust _, robust a, robust job
a robert » 3 robert, dr robert, a robot
book » books, ebook
eeeebooksss » eeeebookssss, eeeeebooksss, eeeebookss, eeebookss
ebookss » ebooksss, eebookss, ebooks
eebookss » eebooksss, eeebookss, eebooks, ebooks

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. heinemann book ) or ( a robert _. heimann (eeeebooksss or (ebookss OR eebookss)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( a robust j. heinemann book ) OR ( a robert _. heimann (eeeebooksss OR (ebookss OR eebookss)) ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( a robust j. heinemann book ) or ( a robert _. heimann (eeeebooksss or (ebookss OR eebookss)) ))*".