Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, kieu tinh
hanh trinh » hanh chinh
trung cong » truong cong, trong cong, trung uong
trinh toan » tinh toan, thanh toan, trinh han
chau tinh » cuu tinh, ha tinh, cua tinh
vi trung » va trung, viet trung, vien trung
toan ban » van ban

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 tinh) OR (chau 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 tinh) OR (chau 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 tinh) OR (chau tinh)) - ((hanh trinh) or (canh tranh)) vi trung cong trinh toan ban".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu tinh) OR (chau tinh)) - ((hanh trinh) or (canh tranh)) vi trung cong trinh toan ban*.