Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
chieu sach » chinh sach, chiet tach, chieu sang
manh dung » manh hung, manh tung, anh dung
dong cong » duong cong, dung cong, dang cong
dung cau » dung chau, dung cu, dung cac
cau dong » cau duong, cau cong, cao dong
tan toan » tap toan, van toan, dan toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (chieu sach)) - manh dung cau dong cong ((tan toan) or (tan tran)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu sach)) - manh dung cau dong cong ((tan toan) OR (tan tran)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu sach)) - manh dung cau dong cong ((tan toan) or (tan tran)) cao*.