Perhaps you should try some spelling variations:
international convention » international cooperation, international context, international communication
convention projects » conservation projects, cooperation projects, convention subject
projects function » projects functions, projected functions, projection function
classes across » clauses across, changes across, claims across
classes cross » classes from, classes case, classes brock

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

• Performing a fuzzy search may retrieve terms with similar spellings: international convention projects function ((classes cross) OR (classes across))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "international convention projects function ((classes cross) OR (classes across))".
• Adding a wildcard symbol may retrieve word variants: international convention projects function ((classes cross) OR (classes across))*.