Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
cau tren » cu tren, dau tren, ca tren
lang hai » lang chai, lang thai, lang ha
cuu tre » cua tre, cau treo
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hai moi » hai muoi, dai moi, nhat moi
ky lang » ky nang, ky dang, ky tang
ve cai » va cai, ve cac, ve tai
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang hai moi. hieu ((ve cai) or (va cam)) luc van thanh tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang hai moi. hieu ((ve cai) OR (va cam)) luc van thanh tai ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang hai moi. hieu ((ve cai) or (va cam)) luc van thanh tai ((cuu tre) or (cau tren))*.