Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh cua » tinh cua, trinh luat, trinh luan
hoc hieu » hoc thieu, hoc hien, doc hieu
cong san » cong tac
toan cau » toan cao, toan tap, toan tai
toan ban » van 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 hieu manh - hanh ((trinh cua) or (trinh quan)) trong cong san ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh ((trinh cua) OR (trinh quan)) trong cong san ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh ((trinh cua) or (trinh quan)) trong cong san ((toan cau) or (toan ban))*.