Perhaps you should try some spelling variations:
"dung hoc chieu snippets" » "dung hoc thieu snippets", "dung ho chieu snippets", "dung hoc hien snippets", "dong hoc chieu snippets", "dung thuoc chieu snippets", "trung hoc chieu 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: (((("dung hoc chieu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung hoc chieu snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung hoc chieu snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung hoc chieu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.