Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van phi cong snippets" » "van thi cong snippets", "van phan cong snippets", "van pham cong snippets", "van chi cong snippets", "van phu cong snippets", "van nhi 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 phi 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 phi cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van phi cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van phi cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.