Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van xuan can snippets" » "van quan can snippets", "van tuan can snippets", "van xuat can snippets", "van xuan cang snippets", "van xuan tan snippets", "van xuan chanh 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 xuan can 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 xuan can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van xuan can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van xuan can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.