གཏོང་ལེན་ - giving and taking
It's an interesting word and I found a lot of other interesting combinations when I looked at the word this morning using the MyTibetan (iOS, Android) app. Actually any Tibetan dictionary app where you could find words not only starting with a pattern but also found in the middle of other terms is very useful for such Tibetan language spelunking.
To start with, གཏོང་ལེན་ has been translated into English as both as taking and giving and giving and receiving. as གཏོང་ means to give and ལེན་ to receive, the official order should be giving and receiving. Then again the practice starts with first taking all the suffering from sentient beings, transform it, and then give it back in form of all happiness there is. So it's a debate what is proper. Or maybe it does not matter.
To my surprise I found other instances where གཏོང་ལེན་ was used in various other -- even contemporary -- words.
དབུགས་གཏོང་ལེན་ is of course obvious, as breath, དབུགས་, is used in the གཏོང་ལེན་ practice. But དབུགས་གཏོང་ལེན་བྱེད་ was an interesting one, respire, where the བྱེད་ is to do, and is used in various things to make a more complex action verb.
ཁ་པར་བཏོན་ལེན་པ་ is a telephonist, from the old days when villages had a telephonist connecting the ཁ་པར་ phone connections.
བུ་ལོན་གཏོང་ལེན་ means to give and take a loan or debt (བུ་ལེན), or a credit system in general.
གཏོང་ལེན་གློག་ is AC current, where གློག is electricity. གཏོང་ལེན་སྐྱེད་འཕྲུལ་འཁོར་ is an AC current generator, སྐྱེད་ to produce or to generate, and འཕྲུལ་འཁོར་ is machine.
དངུལ་སྦྲག་གཏོང་ལེན་ means remittance.དངུལ་ is money, སྦྲག is to connect.
གཏོང་ལེན་སྡེ་ཚན་ is a transport service, སྡེ་ཚན་ has many meanings of which unit, section, department are some of the definitions.
Now what གྲུ་གླ་གཏོང་ལེན་གྱི་ཆོད་གན་ charter party really is, I don't know, but it's listed in the Monlam Eng-Tib dictionary! གྲུ་གླ is boat fare, and ཚོད་ལེན་ is a written agreement.
གཉེན་ཡིག་སློང་ཆང་གཏོང་ལེན་ means betrothal. གཉེན་ཡིག is a Tibetan marriage document (or just a friendly letter), སློང་ཆང་ is proposal-chang (beer) sent with proposal of a marriage. To note, many Tibetan words for marriage is related to ཆང་ such as ཆང་བཟའ་ - eat/drink chang (during the marriage ceremony), or ཆང་ས་ marriage ceremony, or the place ས་ where ཆང་ is available!