Perhaps you should try some spelling variations:
nhien lang » khien bang, nhan lang, nhiet nang
hanh trang » thanh trung, canh tranh, hanh trinh
hieu lang » chieu sang, hieu quang, nhieu tang
tong cong » trong cong, cong cong, dung cong
trang va » tran van, hang va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: (thien OR tien) ((nhien lang) or (hieu lang)) - hanh trang va tong cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (thien OR tien) ((nhien lang) OR (hieu lang)) - hanh trang va tong cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(thien OR tien) ((nhien lang) or (hieu lang)) - hanh trang va tong cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: (thien OR tien) ((nhien lang) or (hieu lang)) - hanh trang va tong cong tac toan cau*.