Perhaps you should try some spelling variations:
thanh trung » thanh tung
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tap » cuong tap, cong tac, cong tan
toan tai » toan tap, doanh tai, toan ban
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 - thanh trung cua thong cong tap ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - thanh trung cua thong cong tap ((toan tai) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - thanh trung cua thong cong tap ((toan tai) or (toan cao))*.