Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung hoc viet slippers" » "dong hoc viet slippers", "dung thuoc viet slippers", "trung hoc viet slippers", "dung hoc hien slippers", "dung hoc viet slippery", "dung hoc viet grippers"
"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 hoc viet 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 hoc viet slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung hoc viet slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung hoc viet slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.