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