Explaining a request does not necessarily report the names of all the underlying database objects accessed by that request, but it does provide the names of all the base tables accessed.
To determine the objects that a particular view accesses, including any nested views, use the SHOW statement. See Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144.
For example, the following request reports the create text and containing databases for all underlying tables and views accessed by view_name.
SHOW QUALIFIED SELECT * FROM view_name;
On the other hand, the following request reports only the underlying tables accessed by view_name, and not any nested views that are accessed.
EXPLAIN SELECT * FROM view_name;