Perhaps you should try some spelling variations:
tranh hoac » thanh hoach, thanh hoa, trinh hoa
hanh tranh » canh tranh, hanh trinh, hanh trang
hoac khong » hoa khong, hoc khong, hay khong
thien anh » thien danh, tien anh, thien thanh
hien anh » hien hanh, dien anh, tien anh
cong dan » cong san, cong tan, cong dong
toan ban » van ban

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: hoc ((hien anh) OR (thien anh)) - hanh tranh hoac khong ((cong dan) OR (huong dan)) toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien anh) OR (thien anh)) - hanh tranh hoac khong ((cong dan) or (huong dan)) toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien anh) OR (thien anh)) - hanh tranh hoac khong ((cong dan) or (huong dan)) toan ban*.