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