Perhaps you should try some spelling variations:
"tuan tran doc snippets" » "tan tran doc snippets", "toan tran doc snippets", "xuan tran doc snippets", "tuan tran duc snippets", "tuan than doc snippets", "tuan tranh duoc 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 tran doc 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 tran doc snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tuan tran doc snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tuan tran doc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.