Perhaps you should try some spelling variations:
construction efforts » conservation efforts, construction errors, construction export
integration theory » integration through, information theory, innovation theory
urban integration » european integration, urban migration, chain integration
soil construction » social construction, rail construction, school construction
supply soil » supply social, supply school, supply soviet

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply urban integration theory. ) or ( supply soil construction efforts. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply urban integration theory. ) OR ( supply soil construction efforts. )).
• Adding a wildcard symbol may retrieve word variants: (( supply urban integration theory. ) or ( supply soil construction efforts. ))*.