Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
sach nay » sach hay, sach vay, sach nang
sach kem » hanh kem
va thanh » gia thanh, ban thanh, va tinh
nam duoc » nam thuoc, da duoc, dat duoc
vai cua » dai cua, hai cua, lai cua
duoc va » nuoc va, duc va, duoc ma
thi van » thi lan, thi hanh, thi nang
cua tre » cua te, cuu tre, cua triet
nang ro » nang co, nang ho, nang ra
sac ky » cac ky, sai ky
ro hoc » co hoc, mo hoc, o hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((((sach nay) or (sach kem))) or (sac ky)) nang ro hoc. thi van nam duoc va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach nay) OR (sach kem))) OR (sac ky)) nang ro hoc. thi van nam duoc va thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach nay) or (sach kem))) or (sac ky)) nang ro hoc. thi van nam duoc va thanh vai cua tre*.