Perhaps you should try some spelling variations:
"vi trung van snippets" » "vi truong van snippets", "vi trong van snippets", "vi trung va snippets", "va trung van snippets", "viet trung van snippets", "vien trung van snippets", "vi trung van slippers"
"using raw java snippets" » "using real java snippets", "using a java snippets", "using low java snippets", "using raw java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("vi trung van snippets") or ("using raw java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vi trung van snippets") OR ("using raw java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vi trung van snippets ) or ( using raw java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vi trung van snippets") or ("using raw java snippets"))) or ("locating bug code snippets"))*.