Perhaps you should try some spelling variations:
thien chinh » thien chien, thi chinh, thien thanh
manh trung » manh tung, thanh trung, manh hung
trung tuan » trung thanh, trung tam, tran tuan
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
luan phan » luan van, luan hoan
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thien chinh) OR (tien thinh)) sach - manh trung tuan ((hang cong) or (bang cong)) luan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thien chinh) OR (tien thinh)) sach - manh trung tuan ((hang cong) OR (bang cong)) luan phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thien chinh) OR (tien thinh)) sach - manh trung tuan ((hang cong) or (bang cong)) luan phan dau".
• Adding a wildcard symbol may retrieve word variants: ((thien chinh) OR (tien thinh)) sach - manh trung tuan ((hang cong) or (bang cong)) luan phan dau*.