Perhaps you should try some spelling variations:
"using compositional tools modelling problem" » "using computational tools modelling problem" (Expand search), "in compositional tools modelling problem" (Expand search), "music compositional tools modelling problem" (Expand search), "using compositional goals modelling problem" (Expand search), "using compositional models modelling problem" (Expand search), "using compositional tools modelling problems" (Expand search), "using compositional tools modeling problems" (Expand search), "using compositional tools covering problem" (Expand search), "using compositional tools modeling problem" (Expand search), "using compositional rolls modelling problem" (Expand search), "using compositional floods modelling problem" (Expand search)
"using population _ coding program" » "aging population _ coding program" (Expand search), "ageing population _ coding program" (Expand search), "young population _ coding program" (Expand search), "using population _ cloning program" (Expand search), "using population _ loading program" (Expand search), "using population _ cooling programs" (Expand search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("using compositional tools modelling problem") OR ("using population _ coding program"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using compositional tools modelling problem\") OR (\"using population _ coding program\"))".
• Removing quotes may allow a broader search: (( using compositional tools modelling problem ) OR ( using population _ coding program )).
• Adding a wildcard symbol may retrieve word variants: (("using compositional tools modelling problem") OR ("using population _ coding program"))*.