Search for Greek letters or symbols in Reader 8.0

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i'm reading document in adobe reader 8.0. document contains many mathematical symbols , greek letters.

how can search character this? i've tried copy character document , paste in search box, character transformed copy-and-paste. (for example, copy greek letter alpha , paste search box, , appears "registered" symbol (r inside circle). copy "is element of" symbol (looks little epsilon) search box, , turns "2".)

how can simple search 1 of these characters?

thanks.



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