Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hai chap snippets" » "van hai chau snippets", "van hai thap snippets", "van lai chau snippets", "van ha chap snippets", "van chat chap snippets", "van hanh chap 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 hai chap 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 hai chap snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hai chap snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hai chap snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.