Perhaps you should try some spelling variations:
2008 international » 2009 international
2018 international » 2017 international, 2019 international
rilem series » wiley series, film series, rilem spring

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 international) OR (2018 international)) rilem series".
• Adding a wildcard symbol may retrieve word variants: ((2008 international) OR (2018 international)) rilem series*.