Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thong cong » tong cong, thong thong, phong chong
nuoc tren » thuoc tren
duoc tren » thuoc tren, dung tren, dua tren
trinh cua » tinh cua, trinh luat, trinh quan
sat phan » sat nhan, vat phan, xuat phan
phan cac » nhan cach, phan dau, phan lap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((nuoc tren) OR (duoc tren)) quang - hanh trinh cua ((thong cong) OR (trong cong)) sat phan cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nuoc tren) or (duoc tren)) quang - hanh trinh cua ((thong cong) OR (trong cong)) sat phan cac~".
• Adding a wildcard symbol may retrieve word variants: ((nuoc tren) or (duoc tren)) quang - hanh trinh cua ((thong cong) OR (trong cong)) sat phan cac*.