Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong vang » cong lang, cong quang, cong ngang
cong van » cong san, song van, cong tan
ban cao » bao cao, ban can, ban co

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (chieu tinh)) - hanh trung cua thong ((cong van) OR (cong vang)) ban cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu tinh)) - hanh trung cua thong ((cong van) OR (cong vang)) ban cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (chieu tinh)) - hanh trung cua thong ((cong van) OR (cong vang)) ban cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chieu tinh)) - hanh trung cua thong ((cong van) OR (cong vang)) ban cao*.