Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
thanh tung » thanh cong
hieu xanh » chieu xanh, hieu manh, hien hanh
dung cong » dung trong
tung cao » nung cao, truong cao, trung cap
cao dung » cao dang, cao dong, cao ung
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau

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 xanh) or (hieu nganh))) or (dieu hanh)) - thanh tung cao dung cong tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((((hieu xanh) OR (hieu nganh))) OR (dieu hanh)) - thanh tung cao dung cong tan tran cau.
• Adding a wildcard symbol may retrieve word variants: doc ((((hieu xanh) or (hieu nganh))) or (dieu hanh)) - thanh tung cao dung cong tan tran cau*.