Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
duc man » duc manh, duc mau, duc van
cua tre » cua te, cuu tre, cua triet
y sang » duy sang
_ sang » _ san
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y sang) OR (_ sang)) ma hoi. hieu va cham ((duc man) or (duc tan)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y sang) OR (_ sang)) ma hoi. hieu va cham ((duc man) OR (duc tan)) thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y sang) OR (_ sang)) ma hoi. hieu va cham ((duc man) or (duc tan)) thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((y sang) OR (_ sang)) ma hoi. hieu va cham ((duc man) or (duc tan)) thanh vi cua tre*.