Perhaps you should try some spelling variations:
chat soc » cham soc, chat hoc, chat doc
cua viet » ca viet, hoa viet, cua dieu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
va dan » ca dan, va dau, va dap
va dao » ca dao

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 nang xa hoi. hieu va chat soc ((va dan) OR (va dao)) dai ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu va chat soc ((va dan) OR (va dao)) dai ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu va chat soc ((va dan) OR (va dao)) dai ((cua viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu va chat soc ((va dan) OR (va dao)) dai ((cua viet) or (cua vat))*.