Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach ky » sach y, sach ty, sach kem
tang xa » trang xa, tang ma, lang xa
sac ky » cac ky, sai ky
va hoc » van hoc
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
co cua » con cua, ca cua, cong cua
nuoc » quoc, duoc, ngoc

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) OR (sac ky)) tang xa hoi. lieu va hoc nuoc ((va dan) or (ca dan)) co cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) tang xa hoi. lieu va hoc nuoc ((va dan) OR (ca dan)) co cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) tang xa hoi. lieu va hoc nuoc ((va dan) or (ca dan)) co cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) tang xa hoi. lieu va hoc nuoc ((va dan) or (ca dan)) co cua viet*.