Create the database using the AL32UTF8 database character set.
The collation settings must match the language settings on the system. Searching for other languages that do not match the database collation setting will result in invalid search and sort results.
Set the regular character set to AL32UTF8. It is not required to set the national character set (NLS_NCHAR_CHARACTERSET) to a specific value. You can take the default. The national character set applies to the data types NCHAR / NVARCHAR2 / NCLOB which the Content Platform Engine does not use.