Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh gia » danh gia, thanh gian, hinh giao
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
duc van » duc va, duc tan, duc manh
gia cua » gian cua, giau cua, gia cuc
ve cac » vien cac
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 ((ve cac) or (va cac)) duc van hanh gia cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((ve cac) OR (va cac)) duc van hanh gia cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((ve cac) or (va cac)) duc van hanh gia cua viet*.