Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van nhan de snippets" » "van phan de snippets", "van thanh de snippets", "danh nhan de snippets", "van nhat de snippets", "van nhan ve snippets", "van nhan dieu 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: (((("python using java snippets") or ("van nhan de snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("van nhan de snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( van nhan de snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("van nhan de snippets"))) or ("locating bug code snippets"))*.