Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, nhung don
trinh cua » tinh cua, trinh luat, trinh quan
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, hoc thieu, doi chieu
dan toan » van toan, dan than, manh toan
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: ((theo tieu) or (ho chieu)) sach - hanh trinh cua ((nhung cong) OR (hang cong)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (ho chieu)) sach - hanh trinh cua ((nhung cong) OR (hang cong)) dan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tieu) or (ho chieu)) sach - hanh trinh cua ((nhung cong) OR (hang cong)) dan toan tap".
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (ho chieu)) sach - hanh trinh cua ((nhung cong) OR (hang cong)) dan toan tap*.