Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di 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 (toc sach)) ky nang xa hoi. ((hieu ve) OR (hieu van)) cham tuc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) ky nang xa hoi. ((hieu ve) OR (hieu van)) cham tuc va hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (toc sach)) ky nang xa hoi. ((hieu ve) OR (hieu van)) cham tuc va hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (toc sach)) ky nang xa hoi. ((hieu ve) OR (hieu van)) cham tuc va hanh vi cua triet*.