Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
cam thuc » nam thuc, cam thu, can thuc
vu sach » vu bach, su sach, vu khach
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
bo sach » co sach, hoc sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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) or (bo sach)) ky nang ma hoi. hieu ve ((cam thuc) or (am thuc)) va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (bo sach)) ky nang ma hoi. hieu ve ((cam thuc) OR (am thuc)) va thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (bo sach)) ky nang ma hoi. hieu ve ((cam thuc) or (am thuc)) va thanh vai cua tre*.