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