Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
dan ban » van ban, can ban, dan ba
ban cau » bang cau, ban can, van cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chinh sach) or (chiet tach)) - hanh trinh cua ((bang cong) or (hang cong)) dan ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (chiet tach)) - hanh trinh cua ((bang cong) OR (hang cong)) dan ban cau.
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (chiet tach)) - hanh trinh cua ((bang cong) or (hang cong)) dan ban cau*.