Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
sach ky » sac ky, sach ty, sach kem
danh di » danh du, xanh di, danh dien
thuc va » thuc vat, thuc dan, thuc day
va cham » va chat, va tham
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
tuc va » truc va, tuc xa, duc va
di cua » dai cua, doi cua, de cua

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 mai hoi. hieu va cham ((tuc va) OR (thuc va)) danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach y)) nang mai hoi. hieu va cham ((tuc va) OR (thuc va)) danh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (sach y)) nang mai hoi. hieu va cham ((tuc va) OR (thuc va)) danh di cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) nang mai hoi. hieu va cham ((tuc va) OR (thuc va)) danh di cua tre*.