Perhaps you should try some spelling variations:
duy nhanh » duy khanh, day nhanh, duy anh
khach ky » thanh ky
dao hanh » dao thanh, dang hanh, ban hanh
cam thuc » am thuc, nam thuc, cam thu
hieu va » lieu va, hieu qua
hanh ky » hanh kem
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((khach ky) OR (hanh ky)) nang x hoi. hieu va cam thuc ((dao hanh) or (duy nhanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((khach ky) OR (hanh ky)) nang x hoi. hieu va cam thuc ((dao hanh) OR (duy nhanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((khach ky) OR (hanh ky)) nang x hoi. hieu va cam thuc ((dao hanh) or (duy nhanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((khach ky) OR (hanh ky)) nang x hoi. hieu va cam thuc ((dao hanh) or (duy nhanh)) di cua tre*.