Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
tinh vi » trinh vi, tinh voi, tinh va
thuc va » thuc vat, thuc day
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va lam » van lam, va lap
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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: tu sac ky ((nang xa) OR (nang x)) hoi. hieu va lam ((thuc va) OR (thuc dan)) tinh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (nang x)) hoi. hieu va lam ((thuc va) OR (thuc dan)) tinh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (nang x)) hoi. hieu va lam ((thuc va) OR (thuc dan)) tinh vi cua tre*.