Perhaps you should try some spelling variations:
bach khoan » bach khoa, cac khoan, bach khang
khoan phai » khong phai, khoa phau, khoan hoi
phai chong » phap chong, pham chuong, khai chuong
sach tham » sach nha
thuc bach » truc bach, thuc cach, thuoc sach
tham thuc » nham thuc, pham thuc, thai thuc
canh tam » canh tac, canh tay, hanh tam
tam thuc » am thuc, nam thuc, dam thuc
bach hoa » bach khoa, bach ha, cach hoan
hoc sach » hoc sinh, hoc cac, hoc anh
so canh » so sanh, bo canh, so danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so canh tam thuc bach hoa he thong ) or ( hoc sach tham thuc bach khoan phai chong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so canh tam thuc bach hoa he thong ) OR ( hoc sach tham thuc bach khoan phai chong )).
• Adding a wildcard symbol may retrieve word variants: (( so canh tam thuc bach hoa he thong ) or ( hoc sach tham thuc bach khoan phai chong ))*.