Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
thuc day » thuc dan, thuc vat
dang deo » dang do, dang dieu, dung demo
hieu va » lieu va, hieu qua
dang de » dung de, dang do, vang de
cua tre » cua te, cuu tre, cua triet
vu sai » vu hai, vu san, vu dai
sai ky » sac ky
x hoi » o 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: vu sai ky nang ((x hoi) OR (xa hoi)). hieu va cac thuc day ((dang de) or (dang deo)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sai ky nang ((x hoi) OR (xa hoi)). hieu va cac thuc day ((dang de) OR (dang deo)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sai ky nang ((x hoi) OR (xa hoi)). hieu va cac thuc day ((dang de) or (dang deo)) cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sai ky nang ((x hoi) OR (xa hoi)). hieu va cac thuc day ((dang de) or (dang deo)) cua tre*.