Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
tong cong » trong cong, dung cong, dang cong
cong cong » cong dong, trong cong, dung cong
vinh toan » tinh toan, hinh toan, minh toan
theo chu » theo chieu, cho chu, chao chu
trinh va » trinh van, trinh vat, trinh ve
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hien) or (theo chu)) tinh - hanh trinh va ((tong cong) OR (cong cong)) vinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (theo chu)) tinh - hanh trinh va ((tong cong) OR (cong cong)) vinh toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hien) or (theo chu)) tinh - hanh trinh va ((tong cong) OR (cong cong)) vinh toan tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (theo chu)) tinh - hanh trinh va ((tong cong) OR (cong cong)) vinh toan tap*.