Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
nhieu tang » chieu sang, hieu lang, nhiet nang
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
cam nhung » cam hung, nam nhung, tham nhung
tung cam » dung cam, trung cap, tung pham
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » 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: hoc ((nhieu tang) or (thieu quang)) - thanh tung cam nhung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((nhieu tang) OR (thieu quang)) - thanh tung cam nhung cong dan toan cau*.