Perhaps you should try some spelling variations:
tcanh tranh » thanh thanh, can tranh, lanh tranh
phuong dong » phuong hoang, chuong duong, phuong dinh
phuong dung » thong dung, cuong dung, phuong hoang
hien tinh » khien tinh, thien tinh, bien tinh
van tuan » van quan, van ban, anh tuan
tuan ban » tuan bang, toan ban, luan 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 hien tinh - ((canh tranh) or (tcanh tranh)) van ((phuong dong) OR (phuong dung)) van tuan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tinh - ((canh tranh) OR (tcanh tranh)) van ((phuong dong) OR (phuong dung)) van tuan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien tinh - ((canh tranh) or (tcanh tranh)) van ((phuong dong) OR (phuong dung)) van tuan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hien tinh - ((canh tranh) or (tcanh tranh)) van ((phuong dong) OR (phuong dung)) van tuan ban*.