Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu nganh » vien nganh, hiem ngan, hieu manh
trung tuan » trung thanh, trung tam, tran tuan
cong quang » luong quang, thong quang, duong quang
hien hanh » dieu hanh
tuan dung » tuan duong, tran dung, tan dung
cong vang » cong lang, cong ngang, cong san
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hien hanh) or (hieu nganh)) - thanh trung tuan dung ((cong vang) OR (cong quang)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hien hanh) OR (hieu nganh)) - thanh trung tuan dung ((cong vang) OR (cong quang)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hien hanh) or (hieu nganh)) - thanh trung tuan dung ((cong vang) OR (cong quang)) toan tap".
• Adding a wildcard symbol may retrieve word variants: doc ((hien hanh) or (hieu nganh)) - thanh trung tuan dung ((cong vang) OR (cong quang)) toan tap*.