Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van hac
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh

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