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

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) OR (thuc dan)) hanh vai 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) OR (thuc dan)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su xac ky dang xay hoi. hieu ve cam ((thuc day) OR (thuc dan)) hanh vai cua tre*.