Yes, but not comma separated ;)
"OR" is considered a keyword for searches (similar to SQL and SOQL). Here's a search similar to yours performed on dataset from my Developer Edition.
List<List<Sobject>> results = [FIND 'Burli* OR Uni*'
IN Name FIELDS
RETURNING Account (Id, Name)
LIMIT 2];
System.debug(JSON.serializePretty(results[0]));
DEBUG|[ {
"attributes" : {
"type" : "Account",
"url" : "/services/data/v29.0/sobjects/Account/0017000000Lg8WgAAJ"
},
"Id" : "0017000000Lg8WgAAJ",
"Name" : "University of Arizona"
}, {
"attributes" : {
"type" : "Account",
"url" : "/services/data/v29.0/sobjects/Account/0017000000Lg8WbAAJ"
},
"Id" : "0017000000Lg8WbAAJ",
"Name" : "Burlington Textiles Corp of America"
} ]
See SOSL reference for more goodies. If the samples on the bottom of the page will look off (all these curly braces) - rememeber that there's slight difference between SOQL called from say SOAP API and the one called from Apex code.