When searching journal title abbreviation (in the version of Web of Science with archive from 1945 to present) New Engl J Med you get no hits. Truncated New Engl* J* Med* returns 81.820 hits. Searching New England Journal of Medicine gives same result.

A search on either Social science & medicine or Social science medicine returns 10.568 hits. A search for Social science and medicine on the other hand returns 0 hits, as does the journal abbreviation Soc Sci Med. A truncated search on Soc* Sci* Med* returns most 11.662.

Also worth mentioning is that search #5 in the search history was not possible to delete. Though I tried both Firefox and Internet Explorer.

Regarding the truncated search with 11.662 hits, a random check on result page 1000 shows the title: SOCIAL SCIENCE & MEDICINE PART C-MEDICAL ECONOMICS:

A search for Social Science & Medicine combined with author Kriedel as in the previous example returns 0 hits. The part A-F is not retrieved when searching Social Science & Medicine.
A search on abbreviated Lancet Neurol or BMj returns 0 hits. Truncated Lancet Neurol* or full title Lancet Neurology as British Medical Journal returns all hits.

Using the Full source titles list and browsing Social Science Medicine returns a list of all parts A-F to the journal.

The conclusion is that searching abbreviated journal titles is impossible in Web of Science and far from perfect in Scopus, but in general it’s more precise to search journal titles in Web of Science than Scopus as long as there are no subparts of the journal. Then you have to truncate or browse in Full source.