Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
dang vat » dang van, dong vat, dang nhat
mang vua » mang cua, mang va, hang va
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu
dang va » dang van, hang va, dung va

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 - hanh ((((dang va) OR (dang vat))) or (mang vua)) nhung cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((((dang va) OR (dang vat))) OR (mang vua)) nhung cong tan toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh ((((dang va) OR (dang vat))) or (mang vua)) nhung cong tan toan cau*".