Perhaps you should try some spelling variations:
sanh thach » danh thanh, anh thanh, hanh thich
thach thuc » thuc thuc, thanh thuy, cach thuc
phap thong » phap phong, phap chong, pho 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
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
so sanh » do sanh
khoa he » hoa he, khoa hoc, khong he
so sach » bo sach, co sach, hoc 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 sanh thach thuc anh khoa he thong ) or ( so sach nham thuc cac khoa phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh thach thuc anh khoa he thong ) OR ( so sach nham thuc cac khoa phap thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh thach thuc anh khoa he thong ) or ( so sach nham thuc cac khoa phap thong ))*.