Perhaps you should try some spelling variations:
national transport » regional transport, international transport
information series » information services, information service, information sources
soil information » social information, school information, local information
cross national » gross national, cross sectional
palm soil » palm oil

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( palm soil information series ) or ( cross national transport policy ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( palm soil information series ) OR ( cross national transport policy )).
• Adding a wildcard symbol may retrieve word variants: (( palm soil information series ) or ( cross national transport policy ))*.