Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
thien van » thi van
vay luan » ly luan, von luan, bai luan
tu sach » thu sach, su sach, te sach
cay qua » cau qua, cac qua, cay lua
vai cua » dai cua, hai cua, lai cua
ty hang » ly hang, ty xang, thi hang
ty sang » ty xang, duy sang, thu sang
cua tre » cua te, cuu tre, cua triet

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 ((ty sang) OR (ty hang)) ma hoa. thien van ((cay qua) or (vay luan)) ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty sang) OR (ty hang)) ma hoa. thien van ((cay qua) OR (vay luan)) ban thanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty sang) OR (ty hang)) ma hoa. thien van ((cay qua) or (vay luan)) ban thanh vai cua tre*".