Perhaps you should try some spelling variations:
than thong » than thuong, toan thong, tran thong
sach nham » sach nha, sach tham, sach han
nham thuc » nhan thuc, nam thuc, nham thu
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
phu thong » pho thong, phap thong, khau thong
sach pham » sach tham, sach phat, sach phap
pham thuc » phap thuc, pham chuc, pham thu
khoa than » khoa luan, hoa thai, hoa tan
khoa phu » khoa phau, khoa thu, hoa phu
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 nham thuc hang khoa phu thong ) or ( so sach pham thuc hang khoa than thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach nham thuc hang khoa phu thong ) OR ( so sach pham thuc hang khoa than thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach nham thuc hang khoa phu thong ) or ( so sach pham thuc hang khoa than thong ))*.