Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dien ly toan snippets" » "dien y toan snippets", "dien le toan snippets", "dien ly hoan snippets", "dien ly tran snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("python using java snippets") or ("dien ly toan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("dien ly toan snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( dien ly toan snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("dien ly toan snippets"))) or ("locating bug code snippets"))*.