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