Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cong dat sach slippers" » "dong dat sach slippers", "cong dan sach slippers", "cong da sach slippers", "cong mat sach slippers", "cong dat khach slippers", "cong nam sach slippers", "cong dat sach slippery", "cong dat sach 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: (((("cong dat sach slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong dat sach slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong dat sach slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong dat sach slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.