Perhaps you should try some spelling variations:
dung phuong » dung thuong, dung chung, hoang phuong
nhieu tang » chieu sang, nhiet nang
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, hieu van
doan toan » dan toan, doan tuan, doanh hoan
toan cau » toan cao, toan ban, toan tap
tung va » trung va, tuong va, dung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thien ((hieu lang) OR (nhieu tang)) - thanh tung va ((dung phuong) or (bang phuong)) doan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien ((hieu lang) OR (nhieu tang)) - thanh tung va ((dung phuong) OR (bang phuong)) doan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thien ((hieu lang) OR (nhieu tang)) - thanh tung va ((dung phuong) or (bang phuong)) doan toan cau".
• Adding a wildcard symbol may retrieve word variants: thien ((hieu lang) OR (nhieu tang)) - thanh tung va ((dung phuong) or (bang phuong)) doan toan cau*.