Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tinh toi snippets" » "van thinh toi snippets", "van minh toi snippets", "ban tinh toi snippets", "van tinh doi snippets", "van dinh toi snippets", "van tinh tri 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 tinh toi 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 tinh toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tinh toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tinh toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.