Perhaps you should try some spelling variations:
dong thuong » dong thong, dung thuong, dong huong
cong thuong » hang thuong
hanh trung » thanh trung, hanh trang, manh trung
trung tuan » trung thanh, trung tam, tran tuan
hoc thieu » toc thieu, hoc hien
ho chieu » theo chieu, doi chieu, mot chieu
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: ((ho chieu) OR (hoc thieu)) tinh - hanh trung tuan ((dong thuong) or (cong thuong)) tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) tinh - hanh trung tuan ((dong thuong) OR (cong thuong)) tinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) tinh - hanh trung tuan ((dong thuong) or (cong thuong)) tinh toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) tinh - hanh trung tuan ((dong thuong) or (cong thuong)) tinh toan cau*.