Perhaps you should try some spelling variations:
"dung toan tran slippers" » "dung doanh tran slippers", "dung thang tran slippers", "dung thanh tran slippers", "dung thoan tran slippers", "dung tan tran slippers", "dung hoan tran slippers", "dung toan tran slippery", "dung toan tran grippers"
"hang java java snippets" » "hang 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 toan tran slippers") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung toan tran slippers") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung toan tran slippers ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung toan tran slippers") or ("hang java java snippets"))) or ("locating bug code snippets"))*.