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