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