How do you explicitly enforce GPT to refer to knowledge base?

I am having some issues with prompting GPT to use knowledge base especially when I am using different language.

Here is my resume, could you find me a suitable position, located in Tokyo, with salary over 6 million yen?

This returns me with the job positions I can find from database

However, questions made for equivalent in Korean
내 이력서를 봤을때, 일본 도쿄 오타구에서 연봉 700만엔 이상, IT직군 일자리 중 10개만 추천해줘

is not returning with job positions.

The GPT is configured to serve and answer explicitly in Korean.

Wondering if there’s a way I can nudge GPT to use knowledge base more aggressively.