Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
xanh dai » vanh dai, xanh di, xanh tai
cay xanh » cay lanh, cao anh, day manh
thuc cay » thuc day, thuc can, thuc cao
su sach » so sach
va nham » va cham, va tham, va nha
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
vu sach » vu bach, vu khach
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: ((su sach) OR (vu sach)) v ((nang ma) or (tang ma)) hoi. lieu va nham thuc cay xanh dai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) v ((nang ma) OR (tang ma)) hoi. lieu va nham thuc cay xanh dai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) v ((nang ma) or (tang ma)) hoi. lieu va nham thuc cay xanh dai cua su".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) v ((nang ma) or (tang ma)) hoi. lieu va nham thuc cay xanh dai cua su*.