Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh vai » hanh vi, hanh va, hanh tai
ky dang » ky nang, ky danh
xay hoi » tay hoi, cay phoi, gay thoi
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky dang ((xay hoi) OR (xa hoi)). hieu ve cam thuc day hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky dang ((xay hoi) OR (xa hoi)). hieu ve cam thuc day hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su xac ky dang ((xay hoi) OR (xa hoi)). hieu ve cam thuc day hanh vai cua tre*.