Perhaps you should try some spelling variations:
khoan phai » khong phai, khoa phau, khoan hoi
phan thong » phan thuong, phan hong, phan tong
phai tuong » phan thuong, pham thuong, pham truong
thuc cach » thuoc sach, truoc cach, thuc hanh
toc sach » hoc sach, doc sach, thuoc sach
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
cach hoa » cach hoan, cach hoc, bach hoa
hoa phan » hoa dan, co phan
tri tac » tri tai, tri mac, thi tac
tac cac » thac cac, tai cac, tap cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( toc sach tri thuc cach hoa phan thong ) or ( te sach tri tac cac khoan phai tuong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach tri thuc cach hoa phan thong ) OR ( te sach tri tac cac khoan phai tuong )).
• Adding a wildcard symbol may retrieve word variants: (( toc sach tri thuc cach hoa phan thong ) or ( te sach tri tac cac khoan phai tuong ))*.