Perhaps you should try some spelling variations:
"tung toan cau snippets" » "dung toan cau snippets", "truong toan cau snippets", "trong toan cau snippets", "tung toan cao snippets", "tung toan ban snippets", "tung toan tap 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: (((("tung toan cau snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tung toan cau snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tung toan cau snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tung toan cau snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.