Perhaps you should try some spelling variations:
hoan chinh » hanh chinh, hoa hinh
tranh luat » trinh luat, tranh luan, trinh luan
luat thong » luat thuong, suat thong, xuat thong
thong cong » trong cong, tong cong, thong thong
hoc chinh » hoc sinh, hoc kinh
tap toan » tap quan, bai toan
tap doan » tap quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chinh) OR (hoan chinh)) sach - canh tranh luat thong cong ((tap toan) or (tap doan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chinh) OR (hoan chinh)) sach - canh tranh luat thong cong ((tap toan) OR (tap doan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chinh) OR (hoan chinh)) sach - canh tranh luat thong cong ((tap toan) or (tap doan)) cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc chinh) OR (hoan chinh)) sach - canh tranh luat thong cong ((tap toan) or (tap doan)) cao*.