Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham tu choi snippets" » "phan tu choi snippets", "pham thi choi snippets", "pham tai choi snippets", "pham su choi snippets", "pham tu chi snippets", "pham tu chon 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: (((("pham tu choi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pham tu choi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham tu choi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham tu choi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.