Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
tang luan » dung luan
nong cong » cong cong, tong cong, nang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
tang cua » mang cua, hang cua, thong cua
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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: hoc hieu manh - hanh ((tang cua) OR (tang luan)) nong cong tan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - hanh ((tang cua) OR (tang luan)) nong cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh ((tang cua) OR (tang luan)) nong cong tan toan cau*.