Perhaps you should try some spelling variations:
thien chinh » tien thinh, thien chien, thi chinh
theo chinh » te chinh, che chinh, thi chinh
hanh trinh » canh tranh, hanh chinh
trinh hoan » trinh han, trinh hoa, trinh toan
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chinh) OR (thien chinh)) sach - hanh trinh hoan ((nhung cong) or (dung cong)) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chinh) OR (thien chinh)) sach - hanh trinh hoan ((nhung cong) OR (dung cong)) dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chinh) OR (thien chinh)) sach - hanh trinh hoan ((nhung cong) or (dung cong)) dan than cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chinh) OR (thien chinh)) sach - hanh trinh hoan ((nhung cong) or (dung cong)) dan than cau*.