Perhaps you should try some spelling variations:
khoan khau » khoanh khac, khoa kham, han khau
phau thong » phap thong, phan thong, phan thuong
khau thong » khau thuong, khap thong, khau tong
sach tham » sach nha
tham thac » tham tham, tham thuc, tham khao
khoa phau » hoa phan, khoa kham, khoa than
thac cac » thoai cac, thanh cac, thuc cach
cac khoa » cac khoi, dac khoa, cao khoa
sach dan » sach danh, sach dao, sach dat
dan thuc » dan toc, am thuc
thuc cac » thuc cach, tuc cac, phuc cac
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 tham thac cac khoa phau thong ) or ( tu sach dan thuc cac khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thac cac khoa phau thong ) OR ( tu sach dan thuc cac khoan khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thac cac khoa phau thong ) or ( tu sach dan thuc cac khoan khau thong ))*.