Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va coc » va cuoc, va cac, va hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. hieu va coc luc ((va tinh) OR (may tinh)) vi ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu va coc luc ((va tinh) OR (may tinh)) vi ((cua tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu va coc luc ((va tinh) OR (may tinh)) vi ((cua tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu va coc luc ((va tinh) OR (may tinh)) vi ((cua tre) or (su triet))*.