Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
bien tinh » bi tinh, diep tinh, ban tinh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cua nhung » va nhung
cong hach » cong sach, cong thanh, cong khanh
yen tinh » tuyen tinh
tinh cua » trinh cua, sinh cua, tinh chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((bien tinh) OR (yen tinh)) - hanh tinh cua nhung cong hach ((toan ban) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((bien tinh) OR (yen tinh)) - hanh tinh cua nhung cong hach ((toan ban) OR (van ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((bien tinh) OR (yen tinh)) - hanh tinh cua nhung cong hach ((toan ban) or (van ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((bien tinh) OR (yen tinh)) - hanh tinh cua nhung cong hach ((toan ban) or (van ban))*.