Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhieu tang » chieu sang, nhiet nang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, hieu van
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) OR (nhieu tang)) - thanh trung cua nhung cong ((tan toan) or (tap toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (nhieu tang)) - thanh trung cua nhung cong ((tan toan) OR (tap toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) OR (nhieu tang)) - thanh trung cua nhung cong ((tan toan) or (tap toan)) cao".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) OR (nhieu tang)) - thanh trung cua nhung cong ((tan toan) or (tap toan)) cao*.