Perhaps you should try some spelling variations:
khong thuc » khong thuoc, khong chuc, phong thuc
thuc hieu » thuc hien, thu hien, thuc tien
hieu nhi » thieu nhi, hieu chi, khieu nai
tu sach » thu sach, te sach, tu cach
bo duoc » co duoc, bo quoc, bo uoc
nhi cua » nghi cua, chi cua, khi cua
su sach » so sach, vu sach
bo oc » bo uoc, bo o

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) khong thuc hieu nhi cua ets : nhung ((bo oc) or (bo duoc)) vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) khong thuc hieu nhi cua ets : nhung ((bo oc) OR (bo duoc)) vi đai.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) khong thuc hieu nhi cua ets : nhung ((bo oc) or (bo duoc)) vi đai*.