Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van anh lon snippets" » "van thanh lon snippets", "van minh lon snippets", "tuan anh lon snippets", "van anh son snippets", "van manh long snippets", "van anh dong 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 anh lon 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 anh lon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van anh lon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van anh lon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.