Perhaps you should try some spelling variations:
su triet » su tien, ve triet
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu le » hieu ve, hieu he, hieu ly
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
su viet » so viet
sac ky » cac ky, sai ky
le nam » ly nam, he nam, le na
nam tu » nam thu, nam thuc

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

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