Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tam cong snippets" » "van tai cong snippets", "van tap cong snippets", "van dam cong snippets", "van tham cong snippets", "van tan cong 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: (((("van tam cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van tam cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tam cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tam cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.