Perhaps you should try some spelling variations:
"trong duc toan snippets" » "trong duoc toan snippets", "trong dua toan snippets", "trong cuoc toan snippets", "trong duc tan snippets", "trong duc ton snippets", "trong duc hoan snippets"
"dung java java snippets" » "dung va java 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: (((("trong duc toan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trong duc toan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trong duc toan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trong duc toan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.