Perhaps you should try some spelling variations:
phan thuc » nhan thuc, phap thuc, pham thuc
may nong » may cong, may nang, mo nong
ban hanh » ban hang
canh may » canh tay, hanh may, mang may
so canh » so sanh, bo canh, so danh
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
cua tre » cua te, cuu tre, cua triet
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: so canh may nong ((x hoi) OR (o hoi)). hieu ve phan thuc ((va hanh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so canh may nong ((x hoi) OR (o hoi)). hieu ve phan thuc ((va hanh) OR (ban hanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so canh may nong ((x hoi) OR (o hoi)). hieu ve phan thuc ((va hanh) or (ban hanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: so canh may nong ((x hoi) OR (o hoi)). hieu ve phan thuc ((va hanh) or (ban hanh)) vai cua tre*.