Perhaps you should try some spelling variations:
works papers » books papers, world papers, work paper
left session » graft session, left decision
papers left » paper left, papers list
2008 part » 2008 paris, 2008 porto, 2008 pt
2008 art » 2008 3rd, 2008 a, 2008 a2

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((2008 art) OR (2008 part)) works papers left session types".
• Adding a wildcard symbol may retrieve word variants: ((2008 art) OR (2008 part)) works papers left session types*.