Perhaps you should try some spelling variations:
chat soc » cham soc, chat hoc, chat doc
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te 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
dan dai » dat dai, can dai, dan dat
soc va » hoc va, loc va, doc va
va dan » ca dan, va dao, va dau

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 lang xa hoi. ((hieu va) OR (hieu qua)) chat soc va dan dai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. ((hieu va) OR (hieu qua)) chat soc va dan dai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. ((hieu va) OR (hieu qua)) chat soc va dan dai cua viet*.