Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
cau luoc » cau luc, muu luoc, hau loc
dang xay » dang van, van xay
su triet » su tien, ve triet
luoc gia » quoc gia, luc gia, luong gia
tu sach » thu sach, su sach, te sach
su viet » so viet
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh

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