Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"danh hoi le snippets" » "danh hoa le snippets", "dan hoi le snippets", "danh hoc le snippets", "danh hoi ve snippets", "danh hai le snippets", "danh hoi e 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: (((("danh hoi le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("danh hoi le snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh hoi le snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh hoi le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.