You can't. By definition
chroot() limits your access in a way, that you can't access anything out of that context. If you need to use other binaries, you need to install them, and their dependencies, in the chroot-environment.
To check what dependencies a certain binary has, you may use the
ldd command. Example:
xila:~# ldd /usr/bin/wget
linux-gate.so.1 => (0xb7784000)
libdl.so.2 => /lib/libdl.so.2 (0xb7775000)
librt.so.1 => /lib/librt.so.1 (0xb776c000)
libssl.so.0.9.8 => /usr/lib/i586/libssl.so.0.9.8 (0xb7729000)
libcrypto.so.0.9.8 => /usr/lib/i586/libcrypto.so.0.9.8 (0xb75ea000)
libc.so.6 => /lib/libc.so.6 (0xb74ac000)
libpthread.so.0 => /lib/libpthread.so.0 (0xb7494000)
libz.so.1 => /usr/lib/libz.so.1 (0xb747e000)
If you want
wget to run in your chroot, you need to copy all those libraries to your chroot - into the appropriate locations. Which means, you need to imitate the directory structure.
However, if one of thos libraries depends on another not listed here, you have to clone this as well. Do an ldd on the libraries as well - eventually you will have found them all.