Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach ty, sach kem
thuc va » thuc vat, thuc dan, thuc day
dan vai » dan va, dan tai, dan vat
vai cau » va cau, van cau, vai cac
va dan » ca dan, va dao, va dau
va nay » va ngay, va cay
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: toc ((sach ky) or (sach y)) nang x hoi. hieu ((va nay) or (ha nam)) thuc va dan vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach y)) nang x hoi. hieu ((va nay) OR (ha nam)) thuc va dan vai cau treo.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) nang x hoi. hieu ((va nay) or (ha nam)) thuc va dan vai cau treo*.