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