Perhaps you should try some spelling variations:
"dung dang thu snippets" » "dung dan thu snippets", "dung dong thu snippets", "dung danh thu snippets", "dung dang thuy snippets", "dung dang thuc snippets", "dung dang thi snippets", "dung dang thu slippers"
"hang java java snippets" » "hang va java snippets", "hang 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: (((("dung dang thu snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung dang thu snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung dang thu snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung dang thu snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.