Pagination Issue- url dont change after search

Hello,

I have a pagination issue with the website of HKex. I try to get all the financial report from the listed company. Yet, after setting the criteria and press the "search" button, the url dont change and fail the scrape the data. I have only tried the basic web scrapping. This issue is too advanced for me. Thanks in advanced if anyone can offer some help.

Url:http://www.hkexnews.hk/listedco/listconews/advancedsearch/search_active_main.aspx

My sitemap:
{"_id":"dhsdh","startUrl":["http://www.hkexnews.hk/listedco/listconews/advancedsearch/search_active_main.aspx"],"selectors":[{"id":"hghfhh","type":"SelectorHTML","selector":"label a:nth-of-type(1) img","parentSelectors":["_root"],"multiple":false,"regex":"","delay":0},{"id":"sdjf","type":"SelectorTable","selector":"form div table","parentSelectors":["hghfhh"],"multiple":false,"columns":[{"header":"Release Time","name":"Release Time","extract":true},{"header":"Code","name":"Code","extract":true},{"header":"Stock Name","name":"Stock Name","extract":true},{"header":"Document","name":"Document","extract":true}],"delay":0,"tableDataRowSelector":"tr:nth-of-type(n+2)","tableHeaderRowSelector":"tr:nth-of-type(1)"}]}