Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc day
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cam » va cham, va cac, va cai
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
va cao » va cac, va co, va dao

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 lang xa hoi. hieu ((va cam) or (va cao)) ((thuc va) or (thuc dan)) dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu ((va cam) OR (va cao)) ((thuc va) OR (thuc dan)) dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu ((va cam) or (va cao)) ((thuc va) or (thuc dan)) dan vi cua tre*.