Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
tuan hang » tuan hoang, tuan dang, tuan hung
tuan bang » tuan dang, tuan hoang, thuat bang
cong tan » cong tac, cong san, cong thanh
tran van » luan van

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 - hanh trinh ((tuan hang) OR (tuan bang)) cong tan tran van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh trinh ((tuan hang) OR (tuan bang)) cong tan tran van".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh trinh ((tuan hang) OR (tuan bang)) cong tan tran van*.