Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoc nganh so snippets" » "hoc nhanh so snippets", "hoc nganh soc snippets", "hoc nganh co snippets", "hoc nganh sp 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: (((("hoc nganh so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc nganh so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc nganh so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc nganh so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.