I couldn't load the results from Z3950 SRU search.

**To Reproduce**
Steps to reproduce the behavior:
1. Connect to 'http://z3950.nlv.gov.vn:9999/biblios'
2. Using Z3950 SRU
3. Found 'x' records, but couldn't show the results
<After a while discovering, I found the errors but couldn't solve it.>
info:srw/diagnostic/1/66: “Unknown schema for retrieval”

**Expected behavior**
Get the results, save records.
 
**Screenshot**
<img width="1123" alt="Screen Shot 2023-08-28 at 09 41 44" src="https://github.com/slims/slims9_bulian/assets/53134115/30904adc-35bb-4863-a6ce-c2e5e5545970">


**Desktop (please complete the following information):**
 - OS: MacOS 10.15
 - Browser: Safari
 

Couldn't load the results from Z3950 SRU 
This is a GitHub Issue
repo:slims9_bulian
owner:slims
Title : Couldn't load the results from Z3950 SRU 
Issue date:

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I couldn't load the results from Z3950 SRU search.

**To Reproduce**
Steps to reproduce the behavior:
1. Connect to 'http://z3950.nlv.gov.vn:9999/biblios'
2. Using Z3950 SRU
3. Found 'x' records, but couldn't show the results
<After a while discovering, I found the errors but couldn't solve it.>
info:srw/diagnostic/1/66: “Unknown schema for retrieval”

**Expected behavior**
Get the results, save records.
 
**Screenshot**
<img width="1123" alt="Screen Shot 2023-08-28 at 09 41 44" src="https://github.com/slims/slims9_bulian/assets/53134115/30904adc-35bb-4863-a6ce-c2e5e5545970">


**Desktop (please complete the following information):**
 - OS: MacOS 10.15
 - Browser: Safari
 

--- end body ---
