Perhaps you should try some spelling variations:
"world trade practices country business guide" » "world trade practices industry business guide", "world trade practices country readiness guide"
"world trade prices central business guide" » "world trade price control business guide", "world crude prices central business guide", "world trade policies central business guide", "world trade services central business guide"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("world trade prices central business guide") or ("world trade practices country business guide"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("world trade prices central business guide") OR ("world trade practices country business guide")).
• Removing quotes may allow a broader search: (( world trade prices central business guide ) or ( world trade practices country business guide )).
• Adding a wildcard symbol may retrieve word variants: (("world trade prices central business guide") or ("world trade practices country business guide"))*.