Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van lam, van cau, van dam
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
vi su » va su, ve su, ki su

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

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