Perhaps you should try some spelling variations:
"toan quoc cong snippets" » "tran quoc cong snippets", "han quoc cong snippets", "toan hoc cong snippets", "toan quoc cuong snippets", "toan nuoc cong snippets", "toan luoc cong 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: (((("toan quoc 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: (((("toan quoc cong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toan quoc cong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toan quoc cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.