Perhaps you should try some spelling variations:
doanh luan » doanh nhan
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
thong dan » thong van, tuong dan, thong den
doc hieu » toc thieu, hoc thieu, hoc hien
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: doc hieu manh - hanh ((doanh luan) or (trung cua)) thong thong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh ((doanh luan) OR (trung cua)) thong thong dan toan cau*.