Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
thieu xanh » chieu xanh, thien anh, thien danh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang cong » dang cong, hang nong, bang cong
han hang » hang hang, han chang, ban hang
cong tan » cong tac, cong san, cong thanh
tran cao » toan cao, tran chau, trang cho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) OR (hieu manh)) - ((hanh trinh) or (canh tranh)) han hang cong tan tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - ((hanh trinh) OR (canh tranh)) han hang cong tan tran cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - ((hanh trinh) or (canh tranh)) han hang cong tan tran cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - ((hanh trinh) or (canh tranh)) han hang cong tan tran cao*.