Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
nang mai » nang ma, nang tai, lang mai
doan dau » doan dieu, phan dau, doan va
te sach » toc sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan
vu pham » su pham, vi pham, vu kham
hieu vu » hieu va, hieu ve, hieu su
mai hoi » mai khoi, dai hoi, lai hoi

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

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