Yes, you can use OR. The actual issue there is probably that you are missing the word OR and missing a quote before the value 2009-2271.
Multiple conditions can be checked by the where clause as shown below :
| inputlookup test.csv | where like(field1, "IP") and not like(field2, "Pass")
Yes, you can use OR, like this where name="abc" OR name="xyz"
OR you can use ... | search name="abc" OR name="xyz"
. Having said that, you should always try to reduce as much as you can in the first (implicit) search command in terms of efficiency. So I would change your query to
index=xyz sourcetype=abc (name="2009-2274" OR name="2009-2271") | dedup name