Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
toc sach » hoc sach, doc sach, thuoc sach
cau treo » cau theo, cau tren, cau triet
hieu ve » hieu va, hieu van
cac duc » cao duc, cac dac, cac nuoc
tang ma » mang may, tang van
cuu tre » cua tre, cau tren
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 6 tang, 7 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y tang ma hoi. hieu ve ((cac duc) or (cac du)) gia thanh dai ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y tang ma hoi. hieu ve ((cac duc) OR (cac du)) gia thanh dai ((cuu tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: toc sach y tang ma hoi. hieu ve ((cac duc) or (cac du)) gia thanh dai ((cuu tre) or (cau treo))*.