Perhaps you should try some spelling variations:
sang minh » kang minah, anh minh, song min
chang mae » chang ha, changes made
yang yao » yang yang, wang yan, yang yi
tan sang » tan yang, tang tang, tan hong
hong hai » shang hai, zhong tai, dang hai
yang ka » yang fan
tan tan » tas tan, tin tan, tang tang

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: yang ((yang ka) OR (yang yao)) tan tan sang minh ((hong hai) OR (chang mae)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang ((yang ka) OR (yang yao)) tan tan sang minh ((hong hai) or (chang mae)) ;~".
• Adding a wildcard symbol may retrieve word variants: yang ((yang ka) OR (yang yao)) tan tan sang minh ((hong hai) or (chang mae)) ;*.