Perhaps you should try some spelling variations:
danh trien » danh truyen, danh kien, manh tien
cham thuc » nham thuc, pham thuc, tham thuc
trien cua » truyen cua, trien nha, tri cua
thuc day » thuc dan, thuc vat
day danh » day manh, dai danh, dao danh
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet

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) or (sach y)) nang xa hoi. hieu va cham thuc day danh trien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ky) OR (sach y)) nang xa hoi. hieu va cham thuc day danh trien cua tre.
• Adding a wildcard symbol may retrieve word variants: doc ((sach ky) or (sach y)) nang xa hoi. hieu va cham thuc day danh trien cua tre*.