Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
cham hoi » cham voi, cham h'roi, pham hoai
va thanh » gia thanh, ban thanh, va tinh
cau treo » cau theo, cau tren, cau triet
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
cuu tre » cua tre, cau tren
y tang » ky tang, 6 tang, 7 tang
cam lo » nam lo, cam ly, cam o
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y tang ma hoi. hieu ve ((cham hoi) or (cam lo)) va thanh tai ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y tang ma hoi. hieu ve ((cham hoi) OR (cam lo)) va thanh tai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y tang ma hoi. hieu ve ((cham hoi) or (cam lo)) va thanh tai ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: hoc sach y tang ma hoi. hieu ve ((cham hoi) or (cam lo)) va thanh tai ((cuu tre) OR (cau treo))*.