Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets", "locating bugs code slippers"
"tran hoang hau snippets" » "quan hoang hau snippets", "tran quang hau snippets", "tranh hang hau snippets", "tran hoang hai snippets", "tran hoang ha snippets", "tran hoang hao snippets", "tran hoang hau slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("tran hoang hau snippets") or ("dung java java snippets"))) or ("locating bugs code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran hoang hau snippets") OR ("dung java java snippets"))) OR ("locating bugs code snippets")).
• Removing quotes may allow a broader search: (((( tran hoang hau snippets ) or ( dung java java snippets ))) or ( locating bugs code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran hoang hau snippets") or ("dung java java snippets"))) or ("locating bugs code snippets"))*.