Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va cham » va chat, va tham
duc ban » duc tan, duc van, dua ban
cua chu » sua chua
cua cu » cua cau, cua su, cua co
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu va cham duc ban hanh vi ((cua cu) OR (cua chu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu va cham duc ban hanh vi ((cua cu) OR (cua chu))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu va cham duc ban hanh vi ((cua cu) OR (cua chu))*.