Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
tang mai » tang ma, tang tai, lang mai
cac thuc » cach thuc, cac thu, cay thuc
can thuc » dan thuc, van thuc, cay thuc
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
y tang » ky tang, 6 tang, 7 tang

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y tang mai hoi. lieu va ((cac thuc) OR (can thuc)) vat thanh dai cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y tang mai hoi. lieu va ((cac thuc) OR (can thuc)) vat thanh dai cua triet*.