Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoi can tre snippets" » "khoa can tre snippets", "khoi nang tre snippets", "hoc can tre snippets", "khoi ban tre snippets", "khoi van tren snippets", "khoi dan tren 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: (((("khoi can tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoi can tre snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoi can tre snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoi can tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.