Perhaps you should try some spelling variations:
"ung dung code snippets" » "ung dung cong snippets", "ung dung co snippets", "ung dung de snippets", "cung dcung code snippets", "ung dung code slippers"
"dung ngo java snippets" » "dung ngon java snippets", "dong ngo java snippets", "dung nga java snippets", "dung ngu java snippets", "dung ngo va snippets", "dcung ngo java snippets", "dung ngo java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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