Perhaps you should try some spelling variations:
khoa thong » hoa thong, thoai thong, pho thong
sanh trong » sinh trong, anh trong, hanh trong
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
trong thu » trong nha
thu hanh » thuc hanh, thu thanh, thuy hanh
hanh hoa » thanh hoa, khanh hoa, hang hoa
hoa khoa » khoa khoa, chua khoa, chia khoa
sach dao » lanh dao
so sanh » do sanh
te sach » toc sach
dao cua » dai cua, day cua, dan cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sanh trong thu hanh hoa khoa thong ) or ( te sach dao cua cac khoan phai thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh trong thu hanh hoa khoa thong ) OR ( te sach dao cua cac khoan phai thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh trong thu hanh hoa khoa thong ) or ( te sach dao cua cac khoan phai thong ))*.