Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
nam thuc » nam thuoc, am thuc, nam thu
dao hanh » dao thanh, dang hanh, ban hanh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
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 ky) or (sach y)) nang x hoi. hieu va nam thuc ((dao hanh) or (day thanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sach y)) nang x hoi. hieu va nam thuc ((dao hanh) OR (day thanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) or (sach y)) nang x hoi. hieu va nam thuc ((dao hanh) or (day thanh)) dai cua tre*.