Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu suat » hieu luat, hieu qua
nham thuc » nhan thuc, nam thuc, nham thu
hieu sau » hieu su, tieu su, hieu va
danh lai » danh sai, gianh lai, dinh lam
sach ke » sach kem, sach de, sach che
ke mang » ke nang, ke trang
may hoi » may thoi, tay hoi, mai hoi
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ke mang may hoi. ((hieu sau) OR (hieu suat)) nham thuc va danh lai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ke mang may hoi. ((hieu sau) OR (hieu suat)) nham thuc va danh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ke mang may hoi. ((hieu sau) OR (hieu suat)) nham thuc va danh lai cua tre*.