Perhaps you should try some spelling variations:
luan duoc » luat duoc, luan nuoc, luan quoc
vay luan » ly luan, von luan, bai luan
va thanh » gia thanh, ban thanh, le thanh
lieu vay » lieu va, lieu xay, lieu van
va tinh » may tinh
sach ky » sach y, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
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 (sac ky)) nang o hoc. lieu vay luan duoc ((va thanh) OR (va tinh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang o hoc. lieu vay luan duoc ((va thanh) OR (va tinh)) dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang o hoc. lieu vay luan duoc ((va thanh) OR (va tinh)) dai cua tre*".