Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
truong ca » truong cao, truong va, trong ca
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tan khan » tan khang, tan nhan, toan khoan
khan cap » khan ap, than cap, khoan cam

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) or (truong ca)) trong cong tan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - thanh ((trung cua) OR (truong ca)) trong cong tan khan cap.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - thanh ((trung cua) or (truong ca)) trong cong tan khan cap*.