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