Perhaps you should try some spelling variations:
"dung dat cheng slippers" » "dung dat hang slippers", "dung dat phong slippers", "dung va cheng slippers", "dung tai cheng slippers", "dung dat cheng slippery", "dung dat cheng grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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