Perhaps you should try some spelling variations:
phan thuc » nhan thuc, phap thuc, pham thuc
may nang » may nong, ky nang, cam nang
than cua » nhan cua, ban cua, gian cua
thai cua » tai cuc, tri cua, dai cua
canh may » canh tay, hanh may, mang may
so canh » so sanh, bo canh, so danh
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
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 nang ((x hoi) or (o hoi)). hieu ve phan thuc va hanh ((thai cua) OR (than cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so canh may nang ((x hoi) OR (o hoi)). hieu ve phan thuc va hanh ((thai cua) OR (than cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so canh may nang ((x hoi) or (o hoi)). hieu ve phan thuc va hanh ((thai cua) OR (than cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so canh may nang ((x hoi) or (o hoi)). hieu ve phan thuc va hanh ((thai cua) OR (than cua)) tre*.