Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van doanh he snippets" » "toan doanh he snippets", "van dong he snippets", "van thanh he snippets", "van doanh ha snippets", "van doanh hieu snippets", "van doanh thu 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 doanh he 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 doanh he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van doanh he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van doanh he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.