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