Perhaps you should try some spelling variations:
"tran thanh de snippets" » "ban thanh de snippets", "van thanh de snippets", "quan thanh de snippets", "tran hanh de snippets", "tran thanh ve snippets", "tran thanh do 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: (((("tran thanh de snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran thanh de snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tran thanh de snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran thanh de snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.