Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van manh toc snippets" » "van minh toc snippets", "van anh toc snippets", "van hanh toc snippets", "van manh toan snippets", "van dan toc snippets", "van manh tu 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 manh toc 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 manh toc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van manh toc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van manh toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.