Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van viet du snippets" » "van viet code snippets", "san viet du snippets", "gian viet du snippets", "tran viet du snippets", "van viet duc snippets", "van viet duy snippets", "van viet tu snippets"
"python using java snippets" » "python using data 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 viet du snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van viet du snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( van viet du snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van viet du snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.