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if ($1 && $2 && $3) { #a }
if ($1 && $2)       { #b }
if ($1 && $3)       { #c }

if ($1) { 
  if ($2) {
...
     #c
  }
}

if    ($name    && $vorname && $plz && $tel && $tel49) { $qry = ""}

...
elsif ($tel)                                           { $qry = ""}
elsif ($tel49)                                         { $qry = ""}
elsif ($vorname)                                       { $qry = ""}