Perhaps you should try some spelling variations:
nay thuc » nam thuc, cay thuc, day thuc
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
vat dan » va dan, van dan, vat ran
dan vai » dan va, dan tai, dan vat
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
va nay » va ngay, va cay

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 ky) or (sach y)) lang xa hoi. hieu va nay thuc vat dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sach y)) lang xa hoi. hieu va nay thuc vat dan vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) or (sach y)) lang xa hoi. hieu va nay thuc vat dan vai cuu tre*.