Perhaps you should try some spelling variations:
thanh nhat » thanh nhan, thanh nha, thanh hai
cam thuc » am thuc, cam thu, cay thuc
can thuc » dan thuc, van thuc, cay thuc
nam thuc » nam thuoc, am thuc, nam thu
da thanh » dao thanh, dat thanh, dam thanh
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
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 nang x hoi. hieu ve ((((cam thuc) OR (can thuc))) or (nam thuc)) da thanh nhat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang x hoi. hieu ve ((((cam thuc) OR (can thuc))) OR (nam thuc)) da thanh nhat cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang x hoi. hieu ve ((((cam thuc) OR (can thuc))) or (nam thuc)) da thanh nhat cua tre*".