An instruction manual stands for the wish to have clear steps for something that feels complicated. Dream books read a missing or unreadable one as facing a situation with no rules to follow.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.