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