Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung dung » phuong dung, thong dung, trung dung
hien tach » thien hach, vien bach, hien hanh
tranh cua » doanh cua, manh cua
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 tach) OR (chiet tach)) - hanh tranh cua ((nhung dung) or (ung dung)) van tuan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien tach) OR (chiet tach)) - hanh tranh cua ((nhung dung) OR (ung dung)) van tuan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien tach) OR (chiet tach)) - hanh tranh cua ((nhung dung) or (ung dung)) van tuan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tach) OR (chiet tach)) - hanh tranh cua ((nhung dung) or (ung dung)) van tuan ban*.