Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
tuan ban » tuan bang, toan ban, luan ban
ban cong » bang cong, van cong, phan cong
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham toan
toan cao » toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (hieu lang)) - ((manh hung) OR (anh huong)) tuan ban cong tam toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (hieu lang)) - ((manh hung) OR (anh huong)) tuan ban cong tam toan cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (hieu lang)) - ((manh hung) OR (anh huong)) tuan ban cong tam toan cao*.