Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hieu manh » chieu xanh, dieu hanh, hien hanh
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
cua dang » cua cong, cua ban
cong tac » cong ty
tac tren » rac tren, tai tren, tap tren
tren cau » tren ca, tren cay, tren tau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((((hieu manh) OR (hieu nganh))) or (hieu lang)) - anh tang cua dang cong tac tren cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((((hieu manh) OR (hieu nganh))) OR (hieu lang)) - anh tang cua dang cong tac tren cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((((hieu manh) OR (hieu nganh))) or (hieu lang)) - anh tang cua dang cong tac tren cau".
• Adding a wildcard symbol may retrieve word variants: theo ((((hieu manh) OR (hieu nganh))) or (hieu lang)) - anh tang cua dang cong tac tren cau*.