Perhaps you should try some spelling variations:
thanh chung » thanh chuong, thanh phuong, nhanh chuong
chieu sang » chieu sach, chieu xanh, hieu lang
thanh hung » thanh huong, thanh tung, thanh trung
nhung cong » dung cong, thong cong, hang cong
hieu quan » hieu qua, lieu quan, thien quan
cua nhung » va nhung
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap

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

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