Perhaps you should try some spelling variations:
"tuan hoang cong snippets" » "quan hoang cong snippets", "tran hoang cong snippets", "xuan hoang cong snippets", "tuan hang cong snippets", "tuan hoang long snippets", "tuan hoang vuong 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: (((("tuan hoang 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: (((("tuan hoang cong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tuan hoang cong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tuan hoang cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.