Perhaps you should try some spelling variations:
"dang vat cham" » "dang van cham", "dong vat cham", "dang nhat cham", "dang va cham", "dang vat chat", "dang viet cham"
"hang va chai" » "hang va cai", "hang va chat", "hang va cham", "bang va chai", "hanh va chai"
"nang va khai" » "nang van khai", "bang va khai", "dang va khai", "nang va khao", "nang va kha"
"nang ma khai" » "tang ma khai", "sang ma khai", "nang cao khai", "nang manh khai", "nang qua khai"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hang va chai") OR ("dang vat cham"))) OR ((("nang va khai") OR ("nang ma khai"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"hang va chai\") or (\"dang vat cham\"))) or (((\"nang va khai\") OR (\"nang ma khai\"))))~".
• Removing quotes may allow a broader search: (((( hang va chai ) or ( dang vat cham ))) or ((( nang va khai ) OR ( nang ma khai ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("hang va chai") or ("dang vat cham"))) or ((("nang va khai") OR ("nang ma khai"))))*.