Perhaps you should try some spelling variations:
"dung tren hoc snippets" » "dung trong hoc snippets", "dung trung hoc snippets", "dung truyen hoc snippets", "dung triet hoc snippets"
"dung vbugss code snippets" » "dung vbugss core snippets", "dung vbungss code snippets", "dung vbugsss code snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs code 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 vbugss code snippets") or ("dung tren hoc snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung vbugss code snippets") OR ("dung tren hoc snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung vbugss code snippets ) or ( dung tren hoc snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung vbugss code snippets") or ("dung tren hoc snippets"))) or ("locating bug code snippets"))*.