Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
cach khoan » cac khoan, cach hoan, coc khoan
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
khoan hoi » khoan nhoi, khoa hoi, khoa hoc
hoi thong » hoi thuong, hoi trong, hoa thong
toan tran » thoan tran, tan tran, hoan tran
tran thuc » trang thuc, toan thuc, tran thuy
thuc bach » truc bach, thuoc sach, thuc hanh
bach khoa » anh khoa
khoa khau » khoa kham, khoa phau, khoa chau
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 thuc cach khoan hoi thong ) or ( thuat toan tran thuc bach khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thuc cach khoan hoi thong ) OR ( thuat toan tran thuc bach khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thuc cach khoan hoi thong ) or ( thuat toan tran thuc bach khoa khau thong ))*.