Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dang xay » dang van, van xay
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
ve cac » va cac, vien cac
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: thuoc sach y ((((dang xay) or (nang x))) or (tang ma)) hoi. hieu ve cac duc va danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((((dang xay) OR (nang x))) OR (tang ma)) hoi. hieu ve cac duc va danh vi cua tre*.