Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cha van toan snippets" » "cha van tuan snippets", "cha van tan snippets", "cha van thanh snippets", "chao van toan snippets", "chau van toan snippets", "chat van toan 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: (((("cha van toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cha van toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cha van toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cha van toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.