Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
chieu tinh » trieu tinh, lieu tinh, chau tinh
trinh luan » trinh luat, trinh quan, trinh han
trinh xay » trinh ky
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 tinh - hanh ((trinh xay) or (trinh luan)) thuong cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tinh - hanh ((trinh xay) OR (trinh luan)) thuong cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - hanh ((trinh xay) or (trinh luan)) thuong cong dan toan cau*.