Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hat pham voi snippets" » "hai pham voi snippets", "ha pham voi snippets", "hao pham voi snippets", "hat pham vi snippets", "hat cham voi snippets", "hat pham doi 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: (((("hat pham voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hat pham voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hat pham voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hat pham voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.