@richie,
The old method of simulating tags, which you are using, has all the tag values in a single field e.g. 'Pune, Goa' and 'Goa, Mumbai, Pune'.
As should become apparent from the example strings above, we can find a particular tag in the strings (e.g. 'Goa') but we cannot sort on that value because the value can possible be at any position in the strings.
So, I am afraid, the answer is no.
The old method of simulating tags, which you are using, has all the tag values in a single field e.g. 'Pune, Goa' and 'Goa, Mumbai, Pune'.
As should become apparent from the example strings above, we can find a particular tag in the strings (e.g. 'Goa') but we cannot sort on that value because the value can possible be at any position in the strings.
So, I am afraid, the answer is no.