Perhaps you should try some spelling variations:
sach duy » sach dung, sach duoc, sach dao
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
lai cho » bai choi, lai cuoc
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
duy anh » duc anh, duy khanh, thuy anh
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, me hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach duy anh ((ma hoi) OR (ma hoa)). hieu va cham duc van hanh ((lai cho) OR (lai chau)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach duy anh ((ma hoi) OR (ma hoa)). hieu va cham duc van hanh ((lai cho) or (lai chau)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach duy anh ((ma hoi) OR (ma hoa)). hieu va cham duc van hanh ((lai cho) or (lai chau)) tre*.