Perhaps you should try some spelling variations:
"dung hoc hat snippets" » "dong hoc hat snippets", "dung thuoc hat snippets", "trung hoc hat snippets", "dung hoc phat snippets", "dung hoc chat snippets", "dung hoc hai snippets", "dung hoc hat slippers"
"hanh va java snippets" » "hang va java snippets", "hanh vi java snippets", "hanh java java snippets", "hanh 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: (((("hanh va java snippets") or ("dung hoc hat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh va java snippets") OR ("dung hoc hat snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh va java snippets ) or ( dung hoc hat snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh va java snippets") or ("dung hoc hat snippets"))) or ("locating bug code snippets"))*.