Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
ve cac » va cac, vien cac
toc va » hoc va, toc ta, loc va
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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