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I have seen apps that read CHM or PDF but not both. I need an app that reads PDF as well as CHM quickly and smoothly. I tried OliveOffice but there are issues with landscape mode. Is there any other ?

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EzPDF is a realy nice PDF Reeder. – Leandros Feb 1 '12 at 15:35
For PDFs I recommend Mantano Reader. – Fase Jan 8 '13 at 2:08
up vote 1 down vote accepted

Moon+ Reader reads chm's and almost anything

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I confirm that Moon Reader can open both PDF and CHM. It can also open epub and other formats. – geffchang May 2 '12 at 11:12
Meanwhile even Mobi. Almost nothing left except for DRM -- which is not the author's fault (trouble with Adobe not reacting on his queries). I use that app almost for 2 years now, amazing development for a one-man-show! – Izzy Jan 8 '13 at 0:36

You could convert your PDF's to CHM:

As you said OliveOffice

or have you tried: iReader

Here is an e-book reader list if you want a 4th option:

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