Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van khac mo snippets" » "van hac mo snippets", "va khac mo snippets", "van khuc mo snippets", "van khac do snippets", "van khac co snippets", "van khai mo 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 khac mo 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 khac mo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van khac mo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van khac mo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.