Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien sach » dien sach, kien sach, thien hach
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
dang cong » dung cong
tinh cua » trinh cua, sinh cua, tinh chat
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sach - hanh tinh cua ((nhung cong) or (dang cong)) san ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hanh tinh cua ((nhung cong) OR (dang cong)) san ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh tinh cua ((nhung cong) or (dang cong)) san ((toan cao) or (toan ban))*.