Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh trang » thanh trung, canh tranh, minh trang
nhung cong » dung cong, thong cong, nhung don
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang cong » dang cong, hang nong, bang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
san chan » san chang, dan chan, san chay
chan tu » phan tu, han tu, chon tu

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 hieu manh - ((hanh trang) OR (hanh trinh)) cua ((nhung cong) OR (hang cong)) san chan tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((hanh trang) or (hanh trinh)) cua ((nhung cong) OR (hang cong)) san chan tu~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh trang) or (hanh trinh)) cua ((nhung cong) OR (hang cong)) san chan tu*.