Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
cam thuc » am thuc, nam thuc, cam thu
dao hanh » dao thanh, dang hanh, ban hanh
sach ty » sach tu, sach thu, xach tay
hieu va » lieu va, hieu qua
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 ((sach ty) or (sach y)) nang x hoi. hieu va cam thuc ((dao hanh) or (day thanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach y)) nang x hoi. hieu va cam thuc ((dao hanh) OR (day thanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sach y)) nang x hoi. hieu va cam thuc ((dao hanh) or (day thanh)) di cua tre*.