# How to reduce space between words in gsm package

I used gms package (a special package of AMS, provided for their Graduate Studies in Maths serie) to write a math book.

I got a problem with space, and then I want to narrow a line by reduce the space between words.

Here is a MWE :

 \documentclass{gsm-l}
\usepackage[papersize={160mm,240mm},inner=20mm, outer=15mm, vmargin=15mm]{geometry}
\usepackage[utf8]{vietnam}
\begin{document}
Vì $BB_0\perp CA$; $CC_0\perp BA$ nên $A, H, B_0, C_0$ cùng
thuộc một đường tròn (3).
\end{document}


And this is what we get after compiling

I want to reduce the space between the words so that "tròn (3)" will go up to the first line.

So what should I do?

Thanks.

• the only place i can see where spacing might reasonably be decreased is around the \perp. if you enclose it in braces -- {\perp} -- it will be treated as an "ordinary" symbol rather than as a binary operator, and almost all space will be omitted. you can also force the last two text elements to hold together by replacing the space before "(3)" by a tie ~. (but there still may not be enough room on the line to accommodate the extra text.) Apr 22 '15 at 15:56

the only place i can see where spacing might reasonably be decreased is around the \perp.
if you enclose it in braces -- {\perp} -- it will be treated as an "ordinary" symbol rather than as a binary operator, and almost all space will be omitted. you can also force the last two text elements to hold together by replacing the space before "(3)" by a tie ~.
a bit more space could be gained by using \noindent, but that may not be appropriate.