Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh, hanh chinh
kien sach » dien sach, vien bach, kien mac
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
hoc kien » hoc hien, hoc vien, hoa kien
dan toan » van toan, dan than, 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 kien sach - hanh trinh cua nhung cong ((xuan toan) or (dan toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc kien sach - hanh trinh cua nhung cong ((xuan toan) OR (dan toan)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc kien sach - hanh trinh cua nhung cong ((xuan toan) or (dan toan)) tap*.