Perhaps you should try some spelling variations:
phan thuc » nhan thuc, phap thuc, pham thuc
thanh hai » thanh phan, thanh hoa, thanh san
thuc day » thuc dan, thuc vat
may nang » may nong, ky nang, cam nang
hanh hai » nhanh hai, hang hai, hanh tai
so mang » so dang, so lang, so bang
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
do mang » doi mang, do dang, do tang
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so mang) OR (do mang)) may nang x hoi. hieu ve phan thuc day ((hanh hai) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so mang) OR (do mang)) may nang x hoi. hieu ve phan thuc day ((hanh hai) OR (thanh hai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so mang) OR (do mang)) may nang x hoi. hieu ve phan thuc day ((hanh hai) or (thanh hai)) cua tre*".