Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cua nhung » va nhung
van thanh » ban thanh, van tuan
tinh cua » trinh cua, sinh cua, tinh chat
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, manh 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 chiet tach - hanh tinh cua nhung cong ((dan toan) or (((van toan) OR (van thanh)))) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh tinh cua nhung cong ((dan toan) OR (((van toan) OR (van thanh)))) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - hanh tinh cua nhung cong ((dan toan) or (((van toan) OR (van thanh)))) ban".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh tinh cua nhung cong ((dan toan) or (((van toan) OR (van thanh)))) ban*.