SQL Server 2012 - Full Text Search [Break word - Underscore]
I found it! :)

I changed the Language for Word Breaker in the Full-Text Catalog to Traditional Chinese.

I used the sys.dm_fts_parser in order to find what language could use the underscore as a break word.

1033 - English

1028 - Traditional Chinese

select * from sys.dm_fts_parser('Oblivion_PS3', 1028, 5, 0)


return Oblivion AND PS3

select * from sys.dm_fts_parser('Oblivion_PS3', 1033, 5, 0)


return Oblivion_PS3