I'm loving the system, but I've notice a small problem. When I searched up "color vanilla" the results were different than those of "vanilla color". Specifically, "vanilla color" starts off with two doujin that are not coloured, and after a brief examination, I noticed that "vanilla color" is also missing a couple of doujin that show up in "color vanilla". Not really sure what's going on, but I hope you work it out? Or not. The tags system is quite awesome enough as it is.
Keep up the good work! :D