Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh thuc
dung thuong » dung trong, cong thuong, dung thuoc
hanh trinh » canh tranh, hanh chinh
theo chieu » theo tieu, ho chieu, theo chu
doc hieu » toc thieu, hoc thieu, hoc hien
dam toan » dan toan, tam toan, dam thanh
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (doc hieu)) tinh - hanh trinh thuat ((dung thuong) OR (hang thuong)) dam toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doc hieu)) tinh - hanh trinh thuat ((dung thuong) OR (hang thuong)) dam toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doc hieu)) tinh - hanh trinh thuat ((dung thuong) OR (hang thuong)) dam toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doc hieu)) tinh - hanh trinh thuat ((dung thuong) OR (hang thuong)) dam toan cau*.