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