Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh oai
thanh dat » thanh san, thanh hai, thanh van
cua triet » cua viet, su triet, va triet
tang mai » tang ma, tang tai, lang mai
cac thuc » cach thuc, cac thu, can 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 vat ((thanh dai) OR (thanh dat)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y tang mai hoi. lieu va cac thuc vat ((thanh dai) OR (thanh dat)) cua triet*.