Hi Alan when u or s.b. say "ما کاری از دستمان بر نمی آید" it means u can't do any things. this sentences is a phrase and "دست" in this sentences doesn't have a special meaning. u know it's because we do most of work with hands this phrase is make.

It means : there is nothing more that I can do or It's not in my strength or I'm not capable of doing that or it's out of my power دست has another usage like دستش از دنیا کوتاهه it means he/she is dead It also has slight meaning of he is dead and has no power in this world sometimes we use both of them in one sentence like this text : وقتی هنوز ۱۸ سالم نشده بود درکی از کلمه سرباز نداشتم چون سرباز تو جایی به اسم پادگان مدفونه!!درسته شاید حرف منو ترسناک قلمداد کنید اما تا وقتی سرباز نباشید نمیفهمید که من چی میگم. مرده دستش از دنیا کوتاهه و هیچ کاری از دستش برنمیاد درست مثل سرباز. from this website: http://www.hasannajafi.ir/?p=228&ckattempt=1

دست دست نکن! means: Don't think twice(I don't exactly remember the expression in Eng) -Don't doubt about it and do it. دست درازی کردن: به مال مردم دست درازی نکن. means: تجاوز کردن/ تعدی کردن. It's complicated even for me! I don't know how to tell you this in Eng. Sorry I can't help with this one. این دست و آن دست کردن: وقت تلف کردن-وقت کشتن means killing time, wasting your time by not doing sth (specific usually)

@Zeinab @Shima H خیلی ممنون!

دست و ‍پا چلفتی someone who cannot do anything correctly دست از پا درازتر when you want to o something but you didn't دوردست far from you دست اندر کار someone who does something in a project