Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh trinh » canh tranh, hanh chinh
dung chung » dung cong, dung ung, dung trung
trinh cua » tinh cua, trinh luat, trinh quan
chung lan » chung luan, nhung lan, chung han
cua dung » cua dang, cua dong, qua dung
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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 trinh cua dung chung lan ((phan cau) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh trinh cua dung chung lan ((phan cau) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - hanh trinh cua dung chung lan ((phan cau) or (phan dau))*.