Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
su cac » tu cac, su cao, su can
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 cac ky ((nang xa) OR (nang x)) hoi. hieu ve cam thuc day hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ky ((nang xa) OR (nang x)) hoi. hieu ve cam thuc day hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su cac ky ((nang xa) OR (nang x)) hoi. hieu ve cam thuc day hanh dai cua tre*.