Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
khong cong » khong cang, chong cong, khong con
thong cong » trong cong, tong cong, thong thong
anh tang » anh bang, anh dang, anh nang
tang hua » tang ha, tang cua, tang luan
bang php » nang phap, bang thep, mang phap
php tap » pha tap, phan tap, phap tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (ho manh)) - anh tang hua ((khong cong) OR (thong cong)) bang php tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (ho manh)) - anh tang hua ((khong cong) OR (thong cong)) bang php tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (ho manh)) - anh tang hua ((khong cong) OR (thong cong)) bang php tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (ho manh)) - anh tang hua ((khong cong) OR (thong cong)) bang php tap*.