Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cau luoc » cau luc, muu luoc, hau loc
luoc gia » quoc gia, luc gia, luong gia
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
doi cua » hoi 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 ky dang xay hoi. ((hieu ve) or (lieu va)) cau luoc gia thanh ((doi cua) OR (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. ((hieu ve) OR (lieu va)) cau luoc gia thanh ((doi cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xay hoi. ((hieu ve) or (lieu va)) cau luoc gia thanh ((doi cua) OR (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. ((hieu ve) or (lieu va)) cau luoc gia thanh ((doi cua) OR (dai cua)) triet*.