Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cong trinh ly slippers" » "cong trinh ky slippers", "cong trinh do slippers", "cong trinh tu slippers", "cong trinh ly slippery", "cong trinh ly 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 trinh ly 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 trinh ly slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong trinh ly slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong trinh ly slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.