Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
sach kem » hanh kem
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
nam duc » nam duoc, pham duc, nam thuc
thi van » thi lan, thi hanh, thi nang
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach hay
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
o hoc » co hoc, mo hoc, so 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 ky) or (sach kem))) or (sac ky)) nang o hoc. thi van nam duc va tinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach ky) OR (sach kem))) OR (sac ky)) nang o hoc. thi van nam duc va tinh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ky) or (sach kem))) or (sac ky)) nang o hoc. thi van nam duc va tinh vai cua tre*.