Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trinh cua » tinh cua, trinh luat, trinh luan
ho chiet » ho chieu, ho thiet, hoa thiet
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 chiet) OR (hoc thiet)) tach - hanh ((trinh cua) or (trinh quan)) nhung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chiet) OR (hoc thiet)) tach - hanh ((trinh cua) OR (trinh quan)) nhung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chiet) OR (hoc thiet)) tach - hanh ((trinh cua) or (trinh quan)) nhung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chiet) OR (hoc thiet)) tach - hanh ((trinh cua) or (trinh quan)) nhung cong dan toan cau*.