Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
hanh trang » canh tranh, hanh trinh, minh trang
tuan thong » toan thong, tran thong, tuan phong
thong tan » thong than, thong tran, thong tin
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

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

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