Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
ban hanh » ban hang
chat soc » cham soc, chat hoc, chat doc
va danh » va dinh, va dan, va hanh
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
va chat » van chat, va phat, cao chat
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: te sach ky ((nang xa) or (nang ma)) hoi. hieu va chat soc ((va danh) or (ban hanh)) di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (nang ma)) hoi. hieu va chat soc ((va danh) OR (ban hanh)) di cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) or (nang ma)) hoi. hieu va chat soc ((va danh) or (ban hanh)) di cua viet*.