Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh dinh » thanh dinh, hinh dinh, hanh tinh
cuu nhung » cua nhung, cuu phuong, chua nhung
thong van » trong van, thong va, thong quan
dinh cuu » dinh chi
hong van » hoang van, phong van, song van
toan cao » toan ban, toan tap

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 dinh cuu nhung ((hong van) or (thong van)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh dinh cuu nhung ((hong van) OR (thong van)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chiet tach)) - hanh dinh cuu nhung ((hong van) or (thong van)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chiet tach)) - hanh dinh cuu nhung ((hong van) or (thong van)) toan cao*.