Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
tang luan » dung luan
cong tinh » cong trinh, cong vinh, long tinh
hang cua » mang cua, hang ca, huong cua
toan tap » toan 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) or (kien sach)) - hanh ((tang luan) or (hang cua)) nhung cong tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (kien sach)) - hanh ((tang luan) OR (hang cua)) nhung cong tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (kien sach)) - hanh ((tang luan) or (hang cua)) nhung cong tinh toan tap*.