Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
thong cong » trong cong, tong cong, thong thong
hang hoc » hang hoa, bang hoc, mang hoc
nang hoc » nang doc, nang luc, dong hoc
cong tap » cuong tap, cong tac, cong tan
tap dan » tap doan, tap danh, tap van
dan bat » danh bat, dan dat, dan ba

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 (chieu sang)) - hanh ((hang hoc) or (nang hoc)) thong cong tap dan bat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chieu sang)) - hanh ((hang hoc) OR (nang hoc)) thong cong tap dan bat.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chieu sang)) - hanh ((hang hoc) or (nang hoc)) thong cong tap dan bat*.