Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
ve nam » he nam, va nam, te nam
le nam » ly nam, he nam, le na

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