Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
trinh toan » tinh toan, thanh toan, trinh han
doi chieu » doc hieu, doi chi, mot chieu
chan dang » phan dang, chan dung, nhan dang
dang cong » dung cong
ho chieu » theo chieu, hoc thieu, mot chieu
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: ((ho chieu) OR (doi chieu)) xanh - ((hanh trinh) OR (canh tranh)) chan dang cong trinh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) xanh - ((hanh trinh) OR (canh tranh)) chan dang cong trinh toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - ((hanh trinh) OR (canh tranh)) chan dang cong trinh toan cau*.