Perhaps you should try some spelling variations:
su triet » su viet, su tien
nam thuc » nam thuoc, am thuc, nam thu
ve triet » va trien
va hanh » van hanh, va thanh, va danh
toc sac » toc sach, toc san, hoc sach
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
ky sang » ky nang, ky dang, ky tang
thuc va » thuc vat, thuc dan, thuc day
va nam » van nam, ha nam, va nay
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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: toc sac ky sang ma hoi. hieu va nam thuc va hanh vi ((cua te) OR (((ve triet) OR (su triet))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky sang ma hoi. hieu va nam thuc va hanh vi ((cua te) or (((ve triet) OR (su triet))))~".
• Adding a wildcard symbol may retrieve word variants: toc sac ky sang ma hoi. hieu va nam thuc va hanh vi ((cua te) or (((ve triet) OR (su triet))))*.