Perhaps you should try some spelling variations:
hien manh » hien hanh, hieu manh, hien nhanh
tien manh » tien anh, tien thanh, tieng anh
hanh tang » hanh trang, anh tang, hanh mang
hang cong » dang cong, hang nong, bang cong
cong tinh » cong trinh, cong vinh, long tinh
cua hang » cua dang, cua nhung, cua cong
tinh van » trinh van, dinh van, tinh va

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 manh) OR (tien manh)) - ((hanh tang) OR (canh tranh)) cua hang cong tinh van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) OR (tien manh)) - ((hanh tang) or (canh tranh)) cua hang cong tinh van ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien manh) OR (tien manh)) - ((hanh tang) or (canh tranh)) cua hang cong tinh van ban*.