Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van cong coi snippets" » "van dong coi snippets", "van phong coi snippets", "phan cong coi snippets", "van cong co snippets", "van con coi snippets", "van cong 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 cong coi 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 cong coi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van cong coi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van cong coi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.