Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets", "locating bugs code slippers"
"dung duc hoang snippets" » "dung duc hoa snippets", "dung duc hung snippets", "dung duc thang snippets", "duong duc hoang snippets", "dang duc hoang snippets", "dung du hoang snippets", "dung duc hoang 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: (((("dung duc hoang snippets") or ("dung java java snippets"))) or ("locating bugs code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung duc hoang snippets") OR ("dung java java snippets"))) OR ("locating bugs code snippets")).
• Removing quotes may allow a broader search: (((( dung duc hoang snippets ) or ( dung java java snippets ))) or ( locating bugs code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung duc hoang snippets") or ("dung java java snippets"))) or ("locating bugs code snippets"))*.