Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong danh » phuong anh, phuong hanh, phuong thanh
phuong dinh » phuong binh, phuong linh, phuong trinh
doi chieu » doi chi, ho chieu, mot chieu
doc hieu » toc thieu, hoc thieu, hoc hien
trung va » truong va, trang va, trung ha
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (doc hieu)) sach - thanh trung va nhung ((phuong danh) OR (phuong dinh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - thanh trung va nhung ((phuong danh) OR (phuong dinh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doc hieu)) sach - thanh trung va nhung ((phuong danh) OR (phuong dinh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) sach - thanh trung va nhung ((phuong danh) OR (phuong dinh)) toan cau*.