Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhieu tang » chieu sang, nhiet nang
thanh tung » thanh cong
hieu lang » chieu sang, hieu van, biet lang
dung cong » dung trong
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau

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

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