Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
khac thong » khac thuong, khac trong, khap thong
sinh khoa » sinh hoc, sinh hoat, anh khoa
khoa phau » hoa phan, khoa kham, khoa than
cach tren » sach tren, cach thien, cach bien
tren thuc » trien thuc, tron thuc, trinh thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa khac » khoa kham, khoanh khac, khoa hoc
sach tri » sach tai, sach tren, sach truc
su sach » so sach, vu sach
tri hoc » triet hoc, tri thuc, thai hoc
tu cach » tu cac

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 hoc sinh khoa phau thong ) or ( tu cach tren thuc hanh khoa khac thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tri hoc sinh khoa phau thong ) OR ( tu cach tren thuc hanh khoa khac thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tri hoc sinh khoa phau thong ) or ( tu cach tren thuc hanh khoa khac thong ))*.