Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
san hanh » san thanh, ban hanh, van hanh
vien cac » vien bach, vien dai, gian cac
ve triet » su triet
hanh ve » hanh vi, hanh va, hanh kem
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
vien da » vien dai, hien dai
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ((vien cac) or (vien da)) toc san hanh ve ((ve triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((vien cac) OR (vien da)) toc san hanh ve ((ve triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((vien cac) or (vien da)) toc san hanh ve ((ve triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((vien cac) or (vien da)) toc san hanh ve ((ve triet) OR (va trien))*.