Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tin cau snippets" » "van tien cau snippets", "van tan cau snippets", "van thinh cau snippets", "van tinh cau snippets", "van tin cac snippets", "van trinh cau 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 tin cau 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 tin cau snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tin cau snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tin cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.