Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lan cua toan snippets" » "lan cuu toan snippets", "lan xuan toan snippets", "lan cua thanh snippets", "lang cua toan snippets", "ban cua toan snippets", "lai cua toan 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: (((("lan cua toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lan cua toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lan cua toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan cua toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.