Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cua hang » cua dang, cua nhung, cua cong
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
toan cau » toan cao, toan ban, toan tap

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: theo ((thu hoach) OR (thuat sach)) - hanh tranh cua hang ((cong van) OR (song van)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((thu hoach) or (thuat sach)) - hanh tranh cua hang ((cong van) OR (song van)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo ((thu hoach) or (thuat sach)) - hanh tranh cua hang ((cong van) OR (song van)) toan cau*.