Perhaps you should try some spelling variations:
thang thoi » khoang thoi, than thoai, trong thoi
khoan pho » khoan nhoi, khoan phai, khoan hoi
duc thang » duc tan, duc hung
sach dai » sach bai, sach dat, sach dau
dai thuc » dan thuc, dai thu, dai thua
thuc cac » thuc cach, tuc cac, phuc cac
sach dao » lanh dao
su sach » vu sach
so sach » so sanh, bo sach, co sach
dao duc » giao duc, tao duoc
thoi he » khoi he, thoi hien, thoai hy

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach dai thuc cac khoan pho thong ) or ( so sach dao duc thang thoi he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach dai thuc cac khoan pho thong ) OR ( so sach dao duc thang thoi he thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach dai thuc cac khoan pho thong ) or ( so sach dao duc thang thoi he thong ))*.