Perhaps you should try some spelling variations:
chiet tach » chieu sach
thong cong » trong cong, tong cong, thong thong
cong ngang » cong nhan, cong quang, cong lang
hanh hang » thanh hang, hang hang, hanh han
va thong » va thuong, va phuong, he thong
tuan cau » toan cau, tuan cu, thuan cam
quan cau » quang cao, toan cau, quan ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chinh sach) or (chiet tach)) - hanh hang va thong cong ngang ((tuan cau) OR (quan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chinh sach) OR (chiet tach)) - hanh hang va thong cong ngang ((tuan cau) OR (quan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chinh sach) or (chiet tach)) - hanh hang va thong cong ngang ((tuan cau) OR (quan cau))".
• Adding a wildcard symbol may retrieve word variants: doi ((chinh sach) or (chiet tach)) - hanh hang va thong cong ngang ((tuan cau) OR (quan cau))*.