Perhaps you should try some spelling variations:
"nhan hoc trinh snippets" » "nhan doc trinh snippets", "nhan hoc tinh snippets", "nhan hoc sinh snippets", "nha hoc trinh snippets", "nhan hoa trinh snippets", "than hoc trinh snippets", "nhan 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: (((("nhan 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: (((("nhan hoc trinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhan hoc trinh snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhan hoc trinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.