Cannot filter strange symbols

I am using this script for google search:
```
read string
query=`echo $string|sed 's/ /+/g'`
curl -H 'User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36' -H 'Connection: keep-alive' https://www.google.com/search?q=$query|html2text --surrogate-escape --escape-all --protect-links|sed 's/├//g;s/á//g;s/┬//g;s/ª//g;s/╕//g;s/«//g;s/╛//g;s/░//g;s/º//g;s/Ñ//g;s/Γ//g;s/ó//g;s/╢//g;s/¼//g;s/¬//g;s/╦//g;s/┼//g;s/╜//g;s/┐//g;s/ñ//g'|vim -
```

But had no luck replacing this strange symbols like:
যদি কয়েক সেকেন্ডের মধ্যে
আà¦à¦¨à¦¿ অন্য সাইটে না যান তাহলে
[এখানে]()
ক্লিক করুন
..........................
..........................
........ please check out my generated output.txt

- Version by `html2text --version`
2017.10.4

- Python version `python --version`
python 3.6.2