Perhaps you should try some spelling variations:
"dung quang ham slippers" » "dung quang ham slices", "dang quang ham slippers", "luong quang ham slippers", "dung luan ham slippers", "dung quang nam slippers", "dung quang lam slippers", "dung quang dam slippers"
"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 quang ham 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 quang ham slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung quang ham slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung quang ham slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.