Trouble with If Statements

I have a complicated If Statement. I'm not sure how I need to organize it.

The code reads if "Lnd" is true then checks if "Ste" matches.

If Lnd = True And Ste = "Stand" Or Ste = "Walk" Or Ste = "Crouch" Or Ste = "Crawl"

Does this code read If Lnd is True then read If Ste matches?
Or does the code read If Lnd is True and Ste = "Stand" then check weather Ste Matches another string and ignore Lnd?

If so is it possible to use parenthesis within if statements?

If ( Lnd = True And ( Ste = "Stand" Or Ste = "Walk" Or Ste = "Crouch" Or Ste = "Crawl" ))

Last one. You even need no outer brackets in your statement.

Depending on the rest of the code you might want to consider a simple 'If lnd=true' and then select/case statements for Ste.
Might not matter now but might help readability in a few weeks time.
<edit> and use more meaningful variable names. I realise it's your code so you know what they mean but, once the code size increases, you'll need readbility more often.
I am guessing this is some of terrain check and the type of state that can be used.
If so using 'Land' (or even land_type) rather than 'lnd' will help.

Also, I would generally use constants in preference to strings for state variables (dependent, obviously, on what you are trying to achieve). Comparisons should be faster.

But no longer type safe. Of course it would be better with a proper type safe enum, but for now, strings are pretty good.