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Within @filter multiple functions can be used with boolean connectives.

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AND, OR, and NOT

Connectives AND, OR, and NOT join filters and can be built into arbitrarily complex filters, such as (NOT A OR B) AND (C AND NOT (D OR E)). Note that, NOT binds more tightly than AND which binds more tightly than OR. Query Example: All Steven Spielberg movies that contain either both “indiana” and “jones” OR both “jurassic” and “park”. 
{
  me(func: eq(name@en, "Steven Spielberg")) @filter(has(director.film)) {
    name@en
    director.film @filter(allofterms(name@en, "jones indiana") OR allofterms(name@en, "jurassic park")) {
      uid
      name@en
    }
  }
}