Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dung sai » dung tai, dung va, dung dat
danh sai » danh bat, danh dau, hanh san
lam thuc » lam thuoc, am thuc, nam thuc
sach ky » sach y, sach ty, sach kem
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
co hoi » co hoc, co loi
sac ky » cac ky, sai ky
va lam » van lam, va lap

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) OR (sac ky)) nang co hoi. hieu va lam thuc va ((danh sai) OR (dung sai)) su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sac ky)) nang co hoi. hieu va lam thuc va ((danh sai) OR (dung sai)) su triet~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) nang co hoi. hieu va lam thuc va ((danh sai) OR (dung sai)) su triet*.