1

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How to make the letters under V bigger, I'm using 10pt on A5 paper in my original document and it's unreadable.

\documentclass{article}

\begin{document}
    $V_{a bc defg}$
\end{document}
5

You asked, "How to make the letters under V bigger"? I assume you mean, "as big as the letter V itself". If this assumption is correct, and if you also intend letters in subscript position to continue to be rendered in math-italic mode, you can use a \textstyle directive at the start of the subscript block; see the code below.

That said, it's typographic custom to typeset math-style subscript and superscript material ca 30% smaller than the material on the baseline (here: the single letter "V").

enter image description here

\documentclass{article}
\begin{document}
$V_{abcdefgVVV}$

$V_{\textstyle abcdefgVVV}$
\end{document}
3

in normalize and upright:

$V_{\mbox{a bc defg}}$

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