Perhaps you should try some spelling variations:
hien trang » huyen trang, mien trung, bien trong
hanh tranh » canh tranh, hanh trinh, hanh trang
hien sang » khien bang, chieu sang, thien bang
tranh cua » doanh cua, manh cua
cua tong » cua cong, cua dong, cua nong
cong tac » cong ty
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: hoc ((hien sang) OR (hien trang)) - hanh tranh cua tong ((cong san) OR (cong tac)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sang) OR (hien trang)) - hanh tranh cua tong ((cong san) or (cong tac)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) OR (hien trang)) - hanh tranh cua tong ((cong san) or (cong tac)) toan cao*.