Perhaps you should try some spelling variations:
phuong dinh » phuong linh, phuong trinh, phuong anh
phuong binh » phuong trinh, phuong anh, chuong trinh
hieu lang » chieu sang, hieu quang, nhieu tang
manh tung » manh hung, thanh tung
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (chinh sach)) - manh tung cua dung ((phuong dinh) OR (phuong binh)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (chinh sach)) - manh tung cua dung ((phuong dinh) OR (phuong binh)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) or (chinh sach)) - manh tung cua dung ((phuong dinh) OR (phuong binh)) than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (chinh sach)) - manh tung cua dung ((phuong dinh) OR (phuong binh)) than cau*.