Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
duc man » duc manh, duc mau, duc van
va cham » va chat, va tham
hieu va » lieu va, hieu qua
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
cua tre » cua te, cuu tre, cua triet
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 ma) OR (nang 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 ma) OR (nang 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 ma) OR (nang 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 ma) OR (nang ma)) hoi. hieu va cham ((duc man) or (duc tan)) thanh vi cua tre*.