Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
xanh tai » hanh tai, anh tai, vanh tai
cay xanh » cay lanh, cao anh, day manh
thuc cay » thuc day, thuc can, thuc cao
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
nang ma » sang ma, nang cao, mang may
tai cua » thai cua, tai cuc, tri cua
tang ma » mang may, tang van
va nam » van nam, ha nam, va nay
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (co sach)) va ((nang ma) or (tang ma)) hoi. lieu va nam thuc cay xanh tai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) va ((nang ma) OR (tang ma)) hoi. lieu va nam thuc cay xanh tai cua su.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) va ((nang ma) or (tang ma)) hoi. lieu va nam thuc cay xanh tai cua su*.