Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
thien tinh » khien tinh, tien tinh, trien tinh
thien minh » tien minh, trien minh, thien chinh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien tinh) or (thien minh)) - hanh tranh cua nhung phuong ((van toan) OR (van tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien tinh) OR (thien minh)) - hanh tranh cua nhung phuong ((van toan) OR (van tuan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien tinh) or (thien minh)) - hanh tranh cua nhung phuong ((van toan) OR (van tuan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien tinh) or (thien minh)) - hanh tranh cua nhung phuong ((van toan) OR (van tuan)) cau*.