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