Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet dac cho snippets" » "viet duc cho snippets", "biet dac cho snippets", "viet bac cho snippets", "viet day cho snippets", "viet danh cho 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: (((("viet dac cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet dac cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet dac cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet dac cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.