Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van thuc do snippets" » "va thuc do snippets", "dan thuc do snippets", "van thu do snippets", "van thuc doi snippets", "van thuoc do snippets", "van thuc co 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 thuc do 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 thuc do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van thuc do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van thuc do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.