Perhaps you should try some spelling variations:
phap chong » phap phong, phap cong, pham hong
sach thac » sach tham, sach nha, cach thuc
thac thuy » thai thuy, thanh thuy, thach thuc
thuy hanh » thuc hanh, thuy anh, thuy canh
hanh khoa » hang khoa, hanh hoa, han khoa
pho thong » he thong
sach nham » sach nha, sach tham, sach han
nham thuc » nhan thuc, nam thuc, nham thu
khoa phap » khoa phau, khoan phai, khong phap
khoa pho » khoa phu, khoa khoa, khoa phau
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach thac thuy hanh khoa pho thong ) or ( so sach nham thuc anh khoa phap chong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach thac thuy hanh khoa pho thong ) OR ( so sach nham thuc anh khoa phap chong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach thac thuy hanh khoa pho thong ) or ( so sach nham thuc anh khoa phap chong ))*.