Perhaps you should try some spelling variations:
dua tren » dung tren
day xanh » day manh, cay xanh, day danh
thuc day » thuc dan, thuc vat
sach ky » sac ky, sach y, sach ty
xanh di » danh di, vanh dai, xanh tai
tu sach » thu sach, su sach, te sach
van hai » van ha, van chat, van hanh
van bac » van ban, van bao, van hac
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ma hoi. hieu ((van bac) or (van hai)) thuc day xanh di ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ((van bac) OR (van hai)) thuc day xanh di ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ((van bac) or (van hai)) thuc day xanh di ((dua tren) or (cuu tre))*.