Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh dieu » han dieu, hinh dieu, hoang dieu
toc sach » hoc sach, doc sach, nuoc sach
qua pham » quan pham, quy pham, qua cham
dieu tra » dieu tri, kiem tra, dieu cua
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
tra tre » tran tren, tran tri, tran tro
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thuoc sach)) v nang xa hoi. hieu qua pham duc va hanh dieu tra tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) v nang xa hoi. hieu qua pham duc va hanh dieu tra tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) v nang xa hoi. hieu qua pham duc va hanh dieu tra tre*.