Perhaps you should try some spelling variations:
duy nhanh » duy khanh, day nhanh, duy anh
khach ky » hanh ky, thanh ky
cac thuc » cach thuc, cac thu, can thuc
dao hanh » dao thanh, dang hanh, ban hanh
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua
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: vay khach ky nang ((x hoi) OR (xa hoi)). hieu va cac thuc ((dao hanh) or (duy nhanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vay khach ky nang ((x hoi) OR (xa hoi)). hieu va cac thuc ((dao hanh) OR (duy nhanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vay khach ky nang ((x hoi) OR (xa hoi)). hieu va cac thuc ((dao hanh) or (duy nhanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: vay khach ky nang ((x hoi) OR (xa hoi)). hieu va cac thuc ((dao hanh) or (duy nhanh)) di cua tre*.