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