Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van quang do snippets" » "van quan do snippets", "tran quang do snippets", "van tuan do snippets", "van quang d snippets", "van quang de snippets", "van quang dong 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 quang do 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 quang do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van quang do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van quang do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.