Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
cau luc » cau truc, cau phuc
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
va cua » va chua, via cua, ca cua
_ dan » _ dau

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 dang) or (_ dan)) xa hoi. hieu va ((coc luc) or (cau luc)) va tinh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky dang) OR (_ dan)) xa hoi. hieu va ((coc luc) OR (cau luc)) va tinh va cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky dang) or (_ dan)) xa hoi. hieu va ((coc luc) or (cau luc)) va tinh va cua triet*.