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