Perhaps you should try some spelling variations:
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
phu thong » pho thong, phap thong, khau thong
chuc hach » chuc hanh, chuc danh, thuc cach
hach khoa » bach khoa, hang khoa, hoc khoa
khoa phan » hoa phan, khoa than, khoa phau
phan tong » phan trong, phan cong, han tong
khoa phu » khoa phau, khoa thu, hoa phu
sach dao » lanh dao
dao chuc » da chuc, dao chu, dao duc
vu sach » vu bach, su sach, vu khach
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: (( vu sach tham thuc hanh khoa phu thong ) or ( te sach dao chuc hach khoa phan tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach tham thuc hanh khoa phu thong ) OR ( te sach dao chuc hach khoa phan tong )).
• Adding a wildcard symbol may retrieve word variants: (( vu sach tham thuc hanh khoa phu thong ) or ( te sach dao chuc hach khoa phan tong ))*.