Perhaps you should try some spelling variations:
"phan hoc trinh snippets" » "phan doc trinh snippets", "phan hoc tinh snippets", "phan hoc sinh snippets", "phap hoc trinh snippets", "phan hoa trinh snippets", "phau hoc trinh snippets", "phan hoc trinh slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("phan hoc trinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan hoc trinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan hoc trinh snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan hoc trinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.