Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dung hoi tran slippers" » "duong hoi tran slippers", "dung hoai tran slippers", "dung thoi tran slippers", "dung hoi trac slippers", "dung thoi trang slippers", "dung hoi thanh slippers", "dung hoi tran slippery", "dung hoi tran grippers"
"locating bug code snippets" » "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 hoi tran slippers") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung hoi tran slippers") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung hoi tran slippers") or ("hang java java snippets"))) or ("locating bug code snippets"))*.