Perhaps you should try some spelling variations:
thanh nha » thanh nhan, thanh nga, thanh phan
nam thuc » nam thuoc, am thuc, nam thu
thanh ha » thanh hoa, thanh hai, nhanh ha
cam thuc » am thuc, cam thu, can thuc
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
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 (nam thuc)) da ((thanh nha) OR (thanh ha)) 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 (nam thuc)) da ((thanh nha) OR (thanh ha)) 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 (nam thuc)) da ((thanh nha) OR (thanh ha)) cua tre*".