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I have had the best luck on the west side, posting up 50-100ft inside the tree line around clear cuts, and glass, glass, glass. Look for tail and ear twitches.Also look for small patches of clearing within the timber.
As stated, don't look for "a deer", look for parts of a deer. An ear or tail flick, a tiny white spot, a part of a leg, a short horizontal line that seems out of place or different from the surrounding area (it just may turn out to be a deer's back or belly). Use your binos even in timber with short sight distance, you will be surprised what you may see.
Here is a good example of a Cowlitz Co buck I found last year and what to look for:
Move very, very slowly. They like to freeze up when they see movement.