Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
hanh hai » thanh hai, nhanh hai, hang hai
dang xay » dang van, van xay
cham duc » pham duc, cham soc, pham duy
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
hieu va » hieu qua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky dang xay hoi. ((hieu va) OR (lieu va)) cham duc va hanh hai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (hoc sach)) ky dang xay hoi. ((hieu va) OR (lieu va)) cham duc va hanh hai cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky dang xay hoi. ((hieu va) OR (lieu va)) cham duc va hanh hai cua triet*.