Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
hieu quang » thieu quang, hieu quan, hieu qua
dang chuan » dong chuan, dang chuyen, zhang chuan
chuan dong » chua dong, chuan long, chuyen dong
nhan dang » nhan dan, phan dang, tran dang
dong cong » duong cong, dung cong, dang cong
cong van » cong vang, cong san, song van
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho ((nhieu tang) or (hieu quang)) - nhan dang chuan dong cong van ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((nhieu tang) OR (hieu quang)) - nhan dang chuan dong cong van ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((nhieu tang) or (hieu quang)) - nhan dang chuan dong cong van ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: nho ((nhieu tang) or (hieu quang)) - nhan dang chuan dong cong van ((toan cau) OR (toan cao))*.