Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
qua cac » cua cac
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh co » danh cho, doanh co, anh co
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo

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 ky nang ((le hoi) or (ma hoa)). hieu qua cac thuc va danh co ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((le hoi) OR (ma hoa)). hieu qua cac thuc va danh co ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((le hoi) or (ma hoa)). hieu qua cac thuc va danh co ((cua tre) or (cuu tre))*.