Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cac chat » cao chat, cac thuat, cac nha
hieu cac » hieu luc, hieu va, hieu van
chat soc » cham soc, chat hoc, chat doc
ky lang » ky dang, ky tang, tay lang
va danh » va dinh, va hanh, dia danh
tu sach » thu sach, su sach, te sach
va dan » ca dan, va dao, va dau
di cua » dai cua, doi cua, de cua

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) or (ky nang)) xa hoi. hieu cac chat soc ((va danh) or (va dan)) di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu cac chat soc ((va danh) OR (va dan)) di cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. hieu cac chat soc ((va danh) or (va dan)) di cua viet*.