I use moon reader + fora (goldendict also works fine) and you can order the dictionary results inside the dictionary app (both fora or goldendict). Other advantage is main dictionary app doesn't use inflected forms file (.syn) so if you have a dictionary with inflections they're not used and you'll miss a lot of words from results.
Main dictionary app has a lot of shortcomings.
Koreader it's another option (reader + dictionary in one), i tested some time ago and i think it allows to orther the dictionaries.
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