Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
phan thanh » pham thanh, ban thanh, van thanh
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
dung cong » dung trong
hoi hieu » hoi phieu, hoi tieu, moi hieu
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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

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