Perhaps you should try some spelling variations:
cach khoan » cac khoan, cach hoan, coc khoan
phan thong » phan thuong, phan hong, phan tong
thuc cach » thuoc sach, truoc cach, thuc hanh
khoan pho » khoan nhoi, khoan phai, khoan hoi
pho thong » he thong
thuc bach » truc bach, thuoc sach, thuc hanh
bach khoa » anh khoa
khoa phan » hoa phan, khoa than, khoa phau
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
su sach » so sach, vu sach
te sach » toc sach

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 tri thuc cach khoan pho thong ) or ( te sach tri thuc bach khoa phan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tri thuc cach khoan pho thong ) OR ( te sach tri thuc bach khoa phan thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tri thuc cach khoan pho thong ) or ( te sach tri thuc bach khoa phan thong ))*.