Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh xay » dang xay, manh xay, anh xay
tinh doi » trinh doc, trinh do, tinh hoc
sach ky » sac ky, sach y, sach ty
doi cua » dai cua, hoi cua
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh, ky dang
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

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