Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
lang van » dang van, tang van, hoang van
thuc cao » thuoc cao, thuc co, thuc can
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
cao dan » cao dang, cao danh, cac dan
dan vai » dan va, dan tai, dan vat
vai cau » va cau, van cau, vai cac
va nam » van nam, va nay

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 ky ((lang xa) or (lang van)) hoi. hieu ((va nam) or (ha nam)) thuc cao dan vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang xa) OR (lang van)) hoi. hieu ((va nam) OR (ha nam)) thuc cao dan vai cau treo.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) or (lang van)) hoi. hieu ((va nam) or (ha nam)) thuc cao dan vai cau treo*.