Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thuc xanh » thuc hanh, thuc thanh, thuc dan
xanh hanh » danh thanh, ban hanh, van hanh
su sach » so sach
vu sach » vu bach, vu khach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
di cua » dai cua, doi cua, de cua
o hoi » co hoi, o hoc, o hai

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)) y nang o hoi. hieu va cham thuc xanh hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang o hoi. hieu va cham thuc xanh hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang o hoi. hieu va cham thuc xanh hanh di cua tre*.