Perhaps you should try some spelling variations:
"dcung hoc cong snippets" » "dung hoc cong snippets", "trung hoc cong snippets", "dong hoc cong snippets", "dcung hoc co snippets", "dcung cac cong snippets", "dcung hoc dung snippets"
"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: (((("dcung hoc cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dcung hoc cong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dcung hoc cong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dcung hoc cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.