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