Perhaps you should try some spelling variations:
cau trieu » cac trieu, cau triet, chua trieu
cay phoi » cap phoi, tay hoi, cay cho
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
tu sach » thu sach, te sach, tu cach
xay hoi » xa hoi, tay hoi, gay thoi
ky dang » ky nang, ky danh
su sach » so sach, vu sach
vi cau » va cau, ve cau, di cau

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 (su sach)) ky dang ((xay hoi) OR (cay phoi)). hieu van cam duc van hanh vi cau trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky dang ((xay hoi) OR (cay phoi)). hieu van cam duc van hanh vi cau trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky dang ((xay hoi) OR (cay phoi)). hieu van cam duc van hanh vi cau trieu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky dang ((xay hoi) OR (cay phoi)). hieu van cam duc van hanh vi cau trieu*.