Perhaps you should try some spelling variations:
"dung sach ty slippers" » "duong sach ty slippers", "dung sai ty slippers", "dung cac ty slippers", "dung sach y slippers", "dung sach tu slippers", "dung sach thu slippers", "dung sach ty slippery", "dung sach ty 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 sach ty 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 sach ty slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung sach ty slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung sach ty slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.