Type with a virtual keyboard
How to search in other languages using an onscreen keyboard
If you use a language that requires special characters (e.g. Arabic, Greek, Thai), enter more precise search terms in YouTube by using the virtual keyboard.
To use the keyboard, just click the keyboard with your mouse, or type the corresponding key on your physical keyboard (not all physical keyboards are compatible).
To display more characters, try clicking Alt+Ctrl and the Up arrow key on the keyboard.