Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
hanh ly » khanh ly, hanh ky, hang ly
ca viet » va viet, hoa viet, san viet
co viet » so viet, o viet, hoc viet
sac 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 ((sac ky) or (cac ky)) nang x ho. hieu va cham duc va hanh ly ((ca viet) OR (co viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) nang x ho. hieu va cham duc va hanh ly ((ca viet) OR (co viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (cac ky)) nang x ho. hieu va cham duc va hanh ly ((ca viet) OR (co viet))*".