Perhaps you should try some spelling variations:
cach khoan » cac khoan, cach hoan, bach khoa
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
thuc thuy » thuc thuc, thu thuy, thac thuy
khoan va » doan va, khoa ma, nhan va
anh thuc » am thuc, dan thuc, anh tu
thuy cac » thuyet cac, thuy canh, thuy luc
cac khoa » cac khoan, cac khoi, dac khoa
le trong » le trung, ly trong, le tang
su sach » so sach, vu sach
khoa le » khoan le, khoa he, hoa le
tu anh » tu hanh, tu manh, thu anh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach tham thuc cach khoan va thuong ) or ( tu anh thuc thuy cac khoa le trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tham thuc cach khoan va thuong ) OR ( tu anh thuc thuy cac khoa le trong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tham thuc cach khoan va thuong ) or ( tu anh thuc thuy cac khoa le trong ))*.