Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tang van don snippets" » "dang van don snippets", "hoang van don snippets", "trong van don snippets", "tang van dong snippets", "tang van doan snippets", "tang van dan 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: (((("tang van don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tang van don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tang van don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tang van don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.