Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lan than cua snippets" » "ban than cua snippets", "van than cua snippets", "dan than cua snippets", "lan nhan cua snippets", "lan thai cua snippets", "lan ban cua 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 than cua 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 than cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lan than cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan than cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.