Perhaps you should try some spelling variations:
lam thuc » lam thuoc, nam thuc, dam thuc
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) or (nang x)) hoi. hieu va ((lam thuc) OR (am thuc)) va tinh vi cua tre~.
• 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) OR (am thuc)) va 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) OR (am thuc)) va tinh vi cua tre*".