了解 → ☊ 
They learn about Vietnamese. ☊ 
Họ tìm hiểu tiếng Việt. ☊ Verbs 2 learn about ☊ tìm hiểu ☊ Verbs 2 like: Tìm hiểu → →
Bitte gib diesen Begriff bei einer Suchmaschine ein und schau dir die Ergebnisse der Suche näher an. ☊ Hãy gõ khái niệm này trên trang tìm kiếm và tìm hiểu kỹ thêm từ các kết quả hiện ra. ☊ (Lektion 99, Nr. 1610) If you don't tell them, nobody will be any the wiser (= they will not find out about it). ☊ any ☊
I was curious to find out what she had said. ☊ curious ☊
I'll have to make a few enquiries (= try to find out about it) and get back to you. ☊ enquiry ☊
learn (about sth): She's very keen to learn about Japanese culture. ☊ learn ☊
learn who, what, etc...: We only learned who the new teacher was a few days ago. ☊ learn ☊
to learn your lines ☊ line ☊
Word always gets out (= people find out about things) no matter how careful you are. ☊ out ☊
Read the manual to learn the program's finer points (= small details). ☊ point ☊
quick (to do sth): The kids were quick to learn. ☊ quick ☊
She's in New York researching her new book (= finding facts and information to put in it). ☊ research ☊
Make sure (that) no one finds out about this. ☊ make sure (of sth/that...) ☊