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