Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vien cac » vien dai, vien da, gian cac
sach ky » sac ky, sach y, sach ty
hoc van » hoc dan, hoc va, hoc vat
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
su sach » so sach, vu sach

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 ((vien cac) or (vien bach)) hoc van ((hanh di) OR (hang di)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((vien cac) OR (vien bach)) hoc van ((hanh di) OR (hang di)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ((vien cac) or (vien bach)) hoc van ((hanh di) OR (hang di)) cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((vien cac) or (vien bach)) hoc van ((hanh di) OR (hang di)) cua triet*.