Perhaps you should try some spelling variations:
"thanh hoc sinh snippets" » "thanh hoa sinh snippets", "than hoc sinh snippets", "thanh ho sinh snippets", "thanh hoc dinh snippets", "thanh hoc minh snippets", "thanh hoc kinh snippets", "thanh hoc sinh 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: (((("thanh hoc sinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thanh hoc sinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thanh hoc sinh snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thanh hoc sinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.