Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh thuc » trinh tu, trinh thi
phau thong » phap thong, khau thong, phan thong
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
khoa phap » khoan phai, khong phap, hoa phan
phap phan » phap phat, phap hoan, phap luan
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
thuc bach » truc bach, thuc cach, thuoc sach
bach khoa » anh khoa
khoa phau » hoa phan, khoa kham, khoa than
tu canh » thu canh, tu chanh, tu can
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: (( tu canh trinh thuc hang khoa phap phan ) or ( te sach tham thuc bach khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu canh trinh thuc hang khoa phap phan ) OR ( te sach tham thuc bach khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu canh trinh thuc hang khoa phap phan ) or ( te sach tham thuc bach khoa phau thong ))*.