Perhaps you should try some spelling variations:
"cach de doan snippets" » "cach de code snippets", "cach de doanh snippets", "cach le doan snippets", "cach du doan snippets", "cac de doan snippets", "sach de doan snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using data snippets" » "python using java snippets", "python using sat snippets", "python missing data snippets"

Try widening your search to All Fields.

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