Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
tuc van » thuc van, truc van, tuc va
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
co sach » bo sach, cuon sach, hoc sach
ve cac » va cac, vien cac
vi cua » vai cua, di cua
ve cam » ve cham, va cam, ve cai

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) or (co sach)) ky lang xa hoi. hieu ((ve cam) OR (ve cac)) tuc van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky lang xa hoi. hieu ((ve cam) OR (ve cac)) tuc van hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky lang xa hoi. hieu ((ve cam) OR (ve cac)) tuc van hanh vi cua triet*".