Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
sac thai » rac thai, toc thai, bac thay
thai tuc » thai thuc, thai thuy, thai hoc
khoan le » khoan ke, hon le, khoan va
le trong » le trung, ly trong, le tang
he trung » le trung, he thong, do trung
tuc cac » tu cac, tich cac
khoa he » hoa he, khoa hoc, khong he
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sac thai tuc cac khoan le trong ) or ( thuoc sach tham thuc hanh khoa he trung ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sac thai tuc cac khoan le trong ) OR ( thuoc sach tham thuc hanh khoa he trung )).
• Adding a wildcard symbol may retrieve word variants: (( tu sac thai tuc cac khoan le trong ) or ( thuoc sach tham thuc hanh khoa he trung ))*.