Perhaps you should try some spelling variations:
trung doanh » trong doanh, trung thanh, trung anh
chieu sang » chieu sach, chieu xanh, nhieu tang
dung doanh » dung dan, dung dong
chung cong » nhung cong, chong cong, phung cong
hieu lang » hieu quang, nhieu tang, hieu van
cong tinh » cong trinh, cong vinh, long tinh
toan cau » 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 ((hieu lang) OR (chieu sang)) - hanh ((trung doanh) or (dung doanh)) chung cong tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sang)) - hanh ((trung doanh) OR (dung doanh)) chung cong tinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (chieu sang)) - hanh ((trung doanh) or (dung doanh)) chung cong tinh toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (chieu sang)) - hanh ((trung doanh) or (dung doanh)) chung cong tinh toan cau*.