Perhaps you should try some spelling variations:
"dung doi ham slippers" » "dung doi ham slices", "huong doi ham slippers", "dung tai ham slippers", "dung co ham slippers", "dung doi nam slippers", "dung do ham slippers", "dung doi dam slippers"
"python using java snippets" » "python using data snippets"
"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 doi ham slippers") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung doi ham slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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