Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
trung cua » truong cua, trung tuan, trung cap
duong van » duong va, dang van, trong van
cua bang » chua bang, cua ban, cua dang
luong va » dung va
toan tap » toan ban

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 (hieu quang)) - thanh trung cua bang ((duong van) or (luong va)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu lang) OR (hieu quang)) - thanh trung cua bang ((duong van) OR (luong va)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu lang) OR (hieu quang)) - thanh trung cua bang ((duong van) or (luong va)) toan tap".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu lang) OR (hieu quang)) - thanh trung cua bang ((duong van) or (luong va)) toan tap*.