Perhaps you should try some spelling variations:
khoa thong » hoa thong, thoai thong, pho thong
thuoc sinh » hoc sinh, thu sinh, thuoc sach
nguoi sach » nguoi san, nuoc sach
tac thuoc » tao thuoc, truc thuoc, tac thuong
sinh chia » dinh chi, sinh khoa, sinh cua
chia khoa » chua khoa, chi khoa, chinh khoa
tac nguoi » toc nguoi, tay nguoi, thuc nguoi
sach tac » sach bac, sach tai, sach tham
sanh tac » canh tac, sang tac, anh ta
sach hoi » sach doi, sach moi, cach thoi
hoc thon » hoc thong, hoa thon, hoc than
su sach » so sach, vu sach
so sanh » do sanh
hoi hoc » hoa hoc, khoa hoc, hoi chuc

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 tac thuoc sinh chia khoa thong ) or ( so sanh tac nguoi sach hoi hoc thon ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tac thuoc sinh chia khoa thong ) OR ( so sanh tac nguoi sach hoi hoc thon )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tac thuoc sinh chia khoa thong ) or ( so sanh tac nguoi sach hoi hoc thon ))*.