My wifi say conected but if i want to use my browser it say there is no conection

Seriously?

You can try Setting / Factory reset

or

https://consumer.huawei.com/uk/support/phones/p8-lite-2017/

I suggest you can approach Unlocking4u.com and specify the country,locked network of Huawei P8 Lite .Based on the availability you can get the permanent unlock service along with free instructions.

try reseting the phone

unless you have the phone locator app switched on before it was stolen , say good bye to it

- go to data/misc/wifi (required root)
-backup file wpa_supplicant.conf in this folder which contains usename and password wifi
- delete all file in this folder
- turn on wifi ( if you careful, you can reboot )
- now you can connect to wifi
- recovery file wpa_supplicant.conf

Delete the registration and then check out pages 12 and 13 of the user manual, below.

http://kasc4.s8.novenaweb.info/files/prod/1028/5/KCA-BT200(EN).pdf

http://www.nintendo.com/consumer/wfc/en_na/ds/wrInitialSetupHelp.jsp

If fail:

Make sure that the wifi settings you have are connect.

See if you are able to connect to another wifi connection.
-Make sure you know the wireless settings for the other wifi connection.
-You may also want to try to connect to an unsecured wifi.

Not if Wifi connection is turned off. You may need to get a new connection and be able to keep the old one for no price. I dont know how to create a new wireless "wifi" allowed net, so you may need to ask around for help.