Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"danh viet oc snippets" » "anh viet oc snippets", "ninh viet oc snippets", "nang viet oc snippets", "danh viet goc snippets", "danh viet o snippets", "danh viet duc 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: (((("danh viet oc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("danh viet oc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh viet oc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh viet oc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.