i want to insert or update values in oracle but values in hindi text

I am inserting hindi text in oracle db 

but not insert in hindi column value is ????????????????????? 

 

????? ???? ????????? ?? ???? ??????? ?? ??? ?????????? ??? ????????? ????? 

 

insert into QUES_MASTER(QUES_CODE,QUES_DESC_ENG,QUES_DESC_HINDI,QUES_SNO,STATUS,OPTION_ID,SURVEY_ID)

values('38','Please refer to guidance note document for more information on focus areas.','????? ???? ????????? ?? ???? ??????? ?? ??? ?????????? ??? ????????? ?????','1','A','7','7')