Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
thuc day » thuc dan, thuc vat
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
day dan » day danh, dao dan, cay dan
dan tai » van tai, dan thi, han tai
tai cau » tai cac, tai cao
va nam » van nam, va nay
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky nang x hoi. hieu ((va nam) or (ha nam)) thuc day dan tai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang x hoi. hieu ((va nam) OR (ha nam)) thuc day dan tai cau treo.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang x hoi. hieu ((va nam) or (ha nam)) thuc day dan tai cau treo*.