Perhaps you should try some spelling variations:
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
sach ky » sac ky, sach y, sach kem
va cham » va chat, va tham
vi cua » vai cua, di cua
soc va » hoc va, loc va, doc va
cua te » cua tu
ma hoi » mai hoi, xa hoi, me hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) OR (sach ty)) tang ((ma hoi) or (ma hoa)). hieu va cham soc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach ty)) tang ((ma hoi) OR (ma hoa)). hieu va cham soc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sach ty)) tang ((ma hoi) or (ma hoa)). hieu va cham soc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) OR (sach ty)) tang ((ma hoi) or (ma hoa)). hieu va cham soc va hanh vi cua te*.