Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phu hoc voi snippets" » "phau hoc voi snippets", "phuc hoc voi snippets", "pho hoc voi snippets", "phu hoc vi snippets", "phu hoc vo snippets", "phu hoc noi 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: (((("phu hoc 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: (((("phu hoc voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phu hoc voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phu hoc voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.