Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
may hoi » may thoi, tay hoi, mai hoi
hieu ve » hieu va, hieu van
cao suc » cao su
cao duc » dao duc, giao duc, tao duoc
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
y mang » cay mang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y mang may hoi. hieu ve ((cao suc) OR (cao duc)) va thanh dai ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y mang may hoi. hieu ve ((cao suc) OR (cao duc)) va thanh dai ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y mang may hoi. hieu ve ((cao suc) OR (cao duc)) va thanh dai ((cuu tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te sach y mang may hoi. hieu ve ((cao suc) OR (cao duc)) va thanh dai ((cuu tre) or (cua tre))*.