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