Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
khoan khau » khoanh khac, khoa kham, khoa phau
can khoan » cac khoan, toan khoan, san khoa
thu thong » thuy thong, thu thang, thu tuong
thu sach » tu sach, thuat sach, thuoc sach
sach tri » sach tai, sach tren, sach truc
cac khoa » cac khoan, cac khoi, dac khoa
khoa thu » khoa than, hoai thu, ho thu
sanh tai » sang tai, hanh tai, anh tai
tai thuc » thai thuc, tri thuc, dai thuc
thuc can » thuc chan, thuc dan, thuc van
tue cac » tu cac, tuc cac, te cac
so sanh » do sanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach tri tue cac khoa thu thong ) or ( so sanh tai thuc can khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach tri tue cac khoa thu thong ) OR ( so sanh tai thuc can khoan khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach tri tue cac khoa thu thong ) or ( so sanh tai thuc can khoan khau thong ))*.