Perhaps you should try some spelling variations:
su triet » su viet, su tien
hanh lam » thanh lap, hanh kem, hanh va
ve triet » va trien
nam thuc » nam thuoc, am thuc, nam thu
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, dam thuc
sach ky » sac ky, sach y, sach ty
xa hanh » xa thanh, xa khanh, va hanh
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang xa hoi. hieu ve ((cam tuc) OR (nam thuc)) xa hanh lam ((ve triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. hieu ve ((cam tuc) OR (nam thuc)) xa hanh lam ((ve triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. hieu ve ((cam tuc) OR (nam thuc)) xa hanh lam ((ve triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. hieu ve ((cam tuc) OR (nam thuc)) xa hanh lam ((ve triet) or (su triet))*.