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How can I find all relevant sequences with Lookup?

I'm looking for Mouse TGF-beta related sequences. I tried an All Text search in Lookup for 'TGF-beta', and found 37 sequences. But M13177, a TGF-beta sequence that I know exists, was not among the list. Why didn't it show up?

The problem is really that there is no standard nomenclature that Genbank depositers use. So some people might describe as sequence with the words 'TGF-beta', and some may use 'Transforming Growth Factor Beta', with or without hyphens. Lookup's indices are pretty good, but they can't take care of all the variations.

The best approach is to think of all the possible variations of your key phrase, and search for all of them. So, in this case, look for 

TGF-beta or Transforming Growth Factor
You need to use & for AND, and | for OR. See the lookup documentation for more information. So a good search would be: 
 Complete the query form below:

                 All text:  TGF-beta | (transforming & growth & factor)
               Definition:
                   Author:
                  Keyword:
            Sequence name:
         Accession number:
                 Organism:  mus musculus
                Reference:
                    Title:
                  Feature:
  On or after (dd-mmm-yy):               On or before (dd-mmm-yy):
 Shortest sequence length:                Longest sequence length:

     Inter-field operator:  AND             Form of output list:  Whole Entries

 Press D to continue.

Searching genbank

 49 entries were found.
As you see, 49 entries were found, among which is GB_RO:MUSTGFRNA, which is your accession number M13177. Note that you can 'fetch' the sequence using either the locus name MUSTGFRNA or the accession number M13177.