Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhieu tang » chieu sang, nhiet nang
bang luong » hang luong, bang suong, bang tuong
nang luong » nang song
hieu lang » chieu sang, hieu quang, hieu van
trung cua » truong cua, trung tuan, trung cap
toan cao » toan ban, toan tap
va toan » van toan, bai toan, tap toan

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

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