Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cap nuoc » dat nuoc
dang xay » dang van, van xay
cac nuoc » hoc nuoc, dat nuoc, cua nuoc
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
vu khac » vu kham, vu khanh, bui khac
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: ((tu sach) or (vu khac)) ky dang xay hoi. hieu ve ((cac nuoc) or (cap nuoc)) va hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu khac)) ky dang xay hoi. hieu ve ((cac nuoc) OR (cap nuoc)) va hanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu khac)) ky dang xay hoi. hieu ve ((cac nuoc) or (cap nuoc)) va hanh di cua triet*.