Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » canh tranh, hanh chinh
cong thanh » dong thanh, cong trinh, cong tan
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
cong dan » cong san, cong tan, huong dan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) or (chinh sach)) - hanh trinh cua nhung ((cong dan) or (cong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chinh sach)) - hanh trinh cua nhung ((cong dan) OR (cong thanh)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (chinh sach)) - hanh trinh cua nhung ((cong dan) or (cong thanh)) toan tap*.