Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cam thuc » am thuc, nam thuc, cam thu
thuc day » thuc dan, thuc vat
hanh vai » hanh va, hanh tai, hanh van
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
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. hieu ve cam thuc day ((hanh vai) OR (hanh vi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky dang xay hoi. hieu ve cam thuc day ((hanh vai) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su xac ky dang xay hoi. hieu ve cam thuc day ((hanh vai) OR (hanh vi)) cua tre*.