Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vay doanh » van doanh, ly doanh, voi doanh
vu pham » su pham, vi pham, vu kham
duc vay » duc va, duc van, duc vy
hieu vu » hieu va, hieu ve, hieu su
sach ky » sac ky, sach y, sach kem
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo

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 ky) OR (sach ty)) lang xa hoi. hieu vu pham duc vay doanh tai ((cua triet) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) lang xa hoi. hieu vu pham duc vay doanh tai ((cua triet) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) lang xa hoi. hieu vu pham duc vay doanh tai ((cua triet) or (cuu tre))*.