For the most part it is throw away. The rules vary from language to language
though. Basically it is broken as ISSI and 2007 and 0 (for ISSI-2007-0), and
ISSI 2007 and 00 for the second one.

I get different results from you.

create table david(pk int identity not null constraint davidpk primary key ,
charcol varchar(20))
GO
create fulltext index on david(charcol) key index davidpk
GO
insert into david(charcol) values('ISSI-2007-0')
insert into david(charcol) values('ISSI-2007-00')
GO
select * from david where contains(*,'ISSI-2007-0')--both found
GO
select * from david where contains(*,'ISSI-2007-00')--only the second is
found
GO