Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sach » chinh sach, chiet tach, chieu sang
hoc chieu » hoc thieu, ho chieu, hoc hien
hanh nhan » thanh nhan, danh nhan, anh nhan
hanh han » hanh phan, hanh san, anh han
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 chieu sach - ((hanh han) OR (hanh nhan)) va nhung cong ((tan toan) or (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - ((hanh han) OR (hanh nhan)) va nhung cong ((tan toan) OR (tan tran)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - ((hanh han) OR (hanh nhan)) va nhung cong ((tan toan) or (tan tran)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - ((hanh han) OR (hanh nhan)) va nhung cong ((tan toan) or (tan tran)) cau*.