Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh thuc » trinh thuc, trang thuc, thanh thuy
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phai tuong, phan thong, khai thuong
phap thong » phap phong, phap chong, pho thong
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, anh khoa
khoa phap » khoa phau, khong phap, hoa phan
thuc cac » tuc cac, phuc cac, thac cac
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
te sach » toc sach
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tranh thuc cac khoan phai thong ) or ( su sach tri thuc cach khoa phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tranh thuc cac khoan phai thong ) OR ( su sach tri thuc cach khoa phap thong ))*.