Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cay xanh » cay lanh, cao anh, day manh
rau xanh » mau xanh, cau danh, cau lanh
tai cua » thai cua, tai cuc, tri cua
vu sach » vu bach, su sach, vu khach
va nham » va cham, va tham, va nha
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
ma hoi » xa hoi, ma hoa, me hoi
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: vu sach y nang ((ma hoi) OR (mai hoi)). lieu va nham thuc ((rau xanh) or (cay xanh)) tai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ((ma hoi) OR (mai hoi)). lieu va nham thuc ((rau xanh) OR (cay xanh)) tai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang ((ma hoi) OR (mai hoi)). lieu va nham thuc ((rau xanh) or (cay xanh)) tai cua su".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ((ma hoi) OR (mai hoi)). lieu va nham thuc ((rau xanh) or (cay xanh)) tai cua su*.