Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
chieu sach » chinh sach, chiet tach, chieu sang
tranh cua » doanh cua, manh cua
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
than tap » toan tap, phan tap, than cap
han tap » han tai, toan tap, nhan tai

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 (thien thanh)) - canh tranh cua dung cong dan ((than tap) or (han tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (thien thanh)) - canh tranh cua dung cong dan ((than tap) OR (han tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (thien thanh)) - canh tranh cua dung cong dan ((than tap) or (han tap))*.