How to access the docs in an app that not available?

I'll post some pics to discribe my problem:

p1: The two apps in red boxes are the very apps. As you can see, there are "cloud icons" beside the apps, which means that the apps aren't actually on my device(this is because I used to change devices).

p2:It shows the not-available dialog box when I tap the app.

p3: I tried to access the docs via itunes, but as you can see, because the apps are not actually on my device, the list is not conclude the very apps.

In conclusion, my goal is to access the docs in the very two apps. Thank you very much.