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