Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van khoa doi snippets" » "van hoa doi snippets", "von khoa doi snippets", "san khoa doi snippets", "van khoa hoi snippets", "van khoa noi 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 khoa doi 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 khoa doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van khoa doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van khoa doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.