Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
nhat hieu » nhat chieu, nha hieu, nhat bieu
hieu lang » chieu sang, hieu quang, nhieu tang
cua duong » qua duong, tuan duong, cua truong
cua huong » cua phuong, cua thuong, cua truong
cua dong » chua dong, cua cong, cua dang
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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: nhat hieu lang - hanh truong ((((cua duong) OR (cua dong))) or (cua huong)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nhat hieu lang - hanh truong ((((cua duong) OR (cua dong))) OR (cua huong)) cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nhat hieu lang - hanh truong ((((cua duong) OR (cua dong))) or (cua huong)) cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: nhat hieu lang - hanh truong ((((cua duong) OR (cua dong))) or (cua huong)) cong tac toan cau*.