Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong dac hoi snippets" » "cong tac hoi snippets", "cong dan hoi snippets", "cong cac hoi snippets", "cong dai hoi snippets", "cong duoc hoi 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: (((("cong dac hoi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong dac hoi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong dac hoi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong dac hoi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.