Perhaps you should try some spelling variations:
"duong nganh cho snippets" » "duong ngan cho snippets", "thuong nganh cho snippets", "dung ngan cho snippets", "duong nganh co snippets", "duong ngang cho snippets", "duong nganh che 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: (((("duong nganh cho snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong nganh cho snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong nganh cho snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong nganh cho snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.