Perhaps you should try some spelling variations:
"dung van tranh slippers" » "dung van thanh slippers", "dung van ranh slippers", "dung can tranh slippers", "duong van tranh slippers", "dung va tranh slippers", "dang van tranh slippers", "dung van tranh slippery", "dung van tranh 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 van tranh 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 van tranh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung van tranh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung van tranh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.