Perhaps you should try some spelling variations:
"tran hoang hao snippets" » "quan hoang hao snippets", "tran quang hao snippets", "tranh hang hao snippets", "tran hoang thao snippets", "tran hoang hai snippets", "tran hoan hao snippets", "tran hoang hao 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: (((("tran hoang hao snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran hoang hao snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tran hoang hao snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran hoang hao snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.