Perhaps you should try some spelling variations:
cach khoan » cac khoan, cach hoan, bach khoa
khoan khau » khoanh khac, khoa kham, khoa phau
sach phap » sach phat, sach nha, sach tham
phap thuc » phap thu, phap hoc, phap tu
thuc cach » thuoc sach, truoc cach, thuc hanh
khau tong » khau thong, khau cong, khau thuong
sach truc » cach thuc, sach tren, sach thu
truc thuc » truc thuoc, thuc thuc, truc thuy
hoc thong » hoc thuong, hoc trong, hoc hong
thuc dai » thuc dan, thuc day, thuc tai
dai khoa » da khoa, tai khoa, dac khoa
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te 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 sach phap thuc cach khoan khau tong ) or ( tu sach truc thuc dai khoa hoc thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach phap thuc cach khoan khau tong ) OR ( tu sach truc thuc dai khoa hoc thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach phap thuc cach khoan khau tong ) or ( tu sach truc thuc dai khoa hoc thong ))*.