Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van nhan cua snippets" » "van phan cua snippets", "van thanh cua snippets", "danh nhan cua snippets", "van nhat cua snippets", "van nhan luc snippets", "van nhan su 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 nhan 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: (((("van nhan cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van nhan cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van nhan cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.