Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
trung cong » truong cong, trong cong, trung uong
trinh toan » tinh toan, thanh toan, trinh han
doi chieu » doc hieu, ho chieu, mot chieu
vi trung » va trung, viet trung, vien trung
toan ban » van ban
doi chi » doi khi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doi chi)) tinh - ((hanh trinh) or (canh tranh)) vi trung cong trinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) tinh - ((hanh trinh) OR (canh tranh)) vi trung cong trinh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doi chi)) tinh - ((hanh trinh) or (canh tranh)) vi trung cong trinh toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doi chi)) tinh - ((hanh trinh) or (canh tranh)) vi trung cong trinh toan ban*.