Perhaps you should try some spelling variations:
sach kem » hanh kem
chat soc » cham soc, chat hoc, chat doc
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
dai hoa » dai khoa, dai hoc, dai hoi
sac ky » cac ky, sai ky

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