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