Perhaps you should try some spelling variations:
trung phuong » truong phuong, rung phuong, thuong phuong
theo chieu » theo tieu, ho chieu, theo chu
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
phuong dan » phuong danh, phuong doan, huong dan
doi chieu » doc hieu, doi chi, ho chieu
cua trung » cua truong, xuan trung, cua nhung
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (doi chieu)) sach - ((hanh tranh) OR (hanh trinh)) cua trung phuong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doi chieu)) sach - ((hanh tranh) OR (hanh trinh)) cua trung phuong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doi chieu)) sach - ((hanh tranh) OR (hanh trinh)) cua trung phuong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doi chieu)) sach - ((hanh tranh) OR (hanh trinh)) cua trung phuong dan toan ban*.