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