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