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

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~.
• 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".
• 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*.