Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
lieu tinh » trieu tinh, diep tinh, bien tinh
cua thong » cua thuong, cua khong, suat thong
cua tong » cua cong, cua dong, cua nong
cong tan » cong tac, cong san, cong thanh
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: theo ((chieu sach) or (lieu tinh)) - hanh trang ((cua thong) OR (cua tong)) cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (lieu tinh)) - hanh trang ((cua thong) OR (cua tong)) cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (lieu tinh)) - hanh trang ((cua thong) OR (cua tong)) cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (lieu tinh)) - hanh trang ((cua thong) OR (cua tong)) cong tan toan cau*.