Perhaps you should try some spelling variations:
hoan chinh » hanh chinh, hoa hinh
tranh tang » tranh hang, tranh trong, trinh trang
tang cuong » nang luong
trong quan » thong quan, tong quan, thong quang
hoc chinh » hoc sinh, hoc kinh
trong tan » trong cac, trong ca, cong tan
tran ban » tranh ban, tran van, 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 chinh) OR (hoan chinh)) sach - canh tranh tang cuong ((trong tan) or (trong quan)) tran ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chinh) OR (hoan chinh)) sach - canh tranh tang cuong ((trong tan) OR (trong quan)) tran ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chinh) OR (hoan chinh)) sach - canh tranh tang cuong ((trong tan) or (trong quan)) tran ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chinh) OR (hoan chinh)) sach - canh tranh tang cuong ((trong tan) or (trong quan)) tran ban*.