Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
thang cua » thong cua, hang cua, than cua
tong cong » trong cong, cong cong, dung cong
hoc hieu » hoc thieu, hoc hien, doc hieu
tang cua » mang cua, hang cua, tang luan
cong tam » cong tac, cong tan, cong nam
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 ((thang cua) or (tang cua)) tong cong tam ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh ((thang cua) OR (tang cua)) tong cong tam ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh ((thang cua) or (tang cua)) tong cong tam ((toan cau) or (toan tap))*.