Perhaps you should try some spelling variations:
"dung tren thi slippers" » "dung trong thi slippers", "dung trung thi slippers", "dung trien thi slippers", "dung tran thi slippers", "dung trieu thi slippers", "dung tren thi slippery", "dung tren thi 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 tren thi 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 tren thi slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tren thi slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tren thi slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.