Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
dung cong » dung trong
van thanh » ban thanh, van tuan
thanh lap » thanh san, phan lap, thanh hai
giang xu » giang xua, gian xu, giang qua
ki sinh » vi sinh, ky sinh
so ki » so ky, so di, so li

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ki sinh - thach giang xu ((dung cong) or (thong cong)) van thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ki sinh - thach giang xu ((dung cong) OR (thong cong)) van thanh lap*.