Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nang noi » nang doc
hang tai » hang va, dung tai
nhan tai » van tai, toan tai
noi hoi » noi doi, doi hoi, hoi hoi
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
vu cam » vu cham, vu cao, va cam
cam lo » nam lo, cam ly, cam o
lo va » lo van, lao va, ly va

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 nang noi hoi. hieu vu cam lo va ((hang tai) or (nhan tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang noi hoi. hieu vu cam lo va ((hang tai) OR (nhan tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang noi hoi. hieu vu cam lo va ((hang tai) or (nhan tai)) cua tre*.