How to use Entityfieldquery with two field conditions for the same field
You should be able to use db_or(), something like this:

$or = db_or()
  -&gt;fieldCondition($field_example, 'tid', (array) $var1)
  -&gt;fieldCondition($field_example, 'tid', (array) $var2);
$query-&gt;condition($or);


More info here.