Perhaps you should try some spelling variations:
hoi thuong » hoai thuong, hoc thuong, boi thuong
pho thong » he thong
hanh khoa » hang khoa, anh khoa, hanh hoa
khoan hoi » khoan nhoi, khoa hoi, khoa hoc
toc sach » hoc sach, doc sach, thuoc sach
sach dai » sach bai, sach dat, sach dau
thu hanh » thuc hanh, thu thanh, thuy hanh
khoa pho » khoa phu, khoa khoa, khoa phau
sach dao » lanh dao
dao thuc » dan thuc, dao tuc, do thuc
thuc cac » thuc cach, tuc cac, phuc cac
dai thu » dai thua, dai thuc, doi thu
vu sach » vu bach, su sach, vu khach

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 dai thu hanh khoa pho thong ) or ( vu sach dao thuc cac khoan hoi thuong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach dai thu hanh khoa pho thong ) OR ( vu sach dao thuc cac khoan hoi thuong )).
• Adding a wildcard symbol may retrieve word variants: (( toc sach dai thu hanh khoa pho thong ) or ( vu sach dao thuc cac khoan hoi thuong ))*.