I recently wrote N'ko text with xetex, it perfectly works !
However, when I tried to search N'ko text (with Ctrl+F) in the pdf file, it does not find the text. To obtain it, I have to reverse the n'ko word.
right word : "ߒߞߏ"
reverse word : "ߏߞߒ"
Is it a bug or I have to add some control sequences ?