Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van danh chi snippets" » "van doanh chi snippets", "van anh chi snippets", "van hanh chi snippets", "van danh cho snippets", "van dinh chi snippets", "van banh chi 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 danh chi 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 danh chi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van danh chi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van danh chi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.